assessment of impact of air pollution among school children in selected schools of dhaka city
TRANSCRIPT
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Assessment of impact of air pollution among school children in selected schools of Dhaka city
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Investigators Prof. Sk. Akhtar AhmadProf Frank MurrayDr. M H Salimullah SayedDr. Manzurul Haque KhanDr. Md. Zakir HossainDr. Nazmul KarimDr. Nahid YasminDr. Md. Mosharof Hossain
&Quazi Sarwar Imtiaz Hashmi
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Background of the study• Degradation of air due to anthropogenic activities is
a major concern all over the world. • Air pollution has become a key environmental issues
in Asia-Pacific region as well with the growth of big cities.
• Air quality in Dhaka is a serious issue in view of the magnitude of its health and economic impacts.
• Huge population growth and infrastructure development affected the major components of the city environment.
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Air quality of Dhaka
• The main air quality problem in Dhaka is the high level of particulate matter.
• Both PM10 and PM 2.5 levels are high, being much above the safety standards especially during the dry season.
• The increasing number of transportation vehicles and their improper management and operation are mainly responsible for degradation of the air quality.
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Air pollution
Source internet
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Air pollution
• Air quality is affected by both human and natural activities.
• Particulate matters (PM) are the major air contributor of air pollutant
• PM is a mixture of particles that can be solid, liquid or both, are suspended in the air and represent a complex mixture of organic and inorganic substances.
• Particles are categorized according to particle size (PM 10 & PM 2.5)
• Size is the important determinant of their effect on human health
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Particulate matters
PM10 • Aerodynamic diameter smaller than 10 μm. • Can reach the upper part of the airways and lung.PM2.5 • Aerodynamic diameter smaller than 2.5 μm• Can penetrate into the lung and may reach the alveolar region.
The major PM components are: • Sulfate• Nitrates• Ammonia,• Sodium chloride• Carbon• Mineral dust and Water
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Evolution of Particulate MattersParticles are directly emitted into the atmosphere through anthropogenic or natural processes.
Anthropogenic processes include • Combustion of fossil fuel , diesel and petrol• Solid-fuel like biomass, coal• Combustion in households• Industrial activities (building, road digging etc)• Erosion of the soil, pavement by road traffic• Human and Vehicular movement
Natural process include• Volcano• Earth quake• Land slide
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Sources of PM
Anthropogenic emissions of PM10• Road traffic (10–25%), • Stationary combustion (40–55%) • Industrial processes (15–30%).
PM2.5 constitutes, on average, about 70% of the PM10 mass (Dockery DW. 2001)
The seasonal variability of PM10 occurs due to the changes in PM2.5 concentration
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Sources ofAir pollution In Dhaka City
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Motor Vehicles in Bangladesh
0
10
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92-93 93- 94 94-95 95-96 96-97 97-98 98-99 99-00 00-01 01-.02 02-.03
Fiscal year
Nu
mb
er
of
ve
hic
le in
th
ou
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Bus Microbus Truck Car/Jeep Autorikshwa Others
Transports contribute47% of air pollution in Dhaka City
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Increasing number of vehicles Improper management operation
Increase of motor vehicles from ‘99-’06.
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Transport
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Average Particulates during April 2002 – February 2005
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Apr-02
Jul-02
Oct-02
Jan-03
Apr-03
Jul-03
Oct-03
Jan-04
Apr-04
Jul-04
Oct-04
Jan-05m
icro
n/m
3
PM10 PM2.5
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Seasonal Variation of Particulate Matter in Dhaka City
PM2.5 Trends in Dhaka CityContinuous Air Quality Monitoring Station
Sangsad Bhaban, DhakaPeriod: April, 2002 to April, 2006
0
65
130
195
260
325
390
455
4/3/
2002
5/3/
2002
6/3/
2002
7/3/
2002
8/3/
2002
9/3/
2002
10/3
/200
211
/3/2
002
12/3
/200
21/
3/20
032/
3/20
033/
3/20
034/
3/20
035/
3/20
036/
3/20
037/
3/20
038/
3/20
039/
3/20
0310
/3/2
003
11/3
/200
312
/3/2
003
1/3/
2004
2/3/
2004
3/3/
2004
4/3/
2004
5/3/
2004
6/3/
2004
7/3/
2004
8/3/
2004
9/3/
2004
10/3
/200
411
/3/2
004
12/3
/200
41/
3/20
052/
3/20
053/
3/20
054/
3/20
055/
3/20
056/
3/20
057/
3/20
058/
3/20
059/
3/20
0510
/3/2
005
11/3
/200
512
/3/2
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1/3/
2006
2/3/
2006
3/3/
2006
4/3/
2006
Date
24-h
ou
r av
erag
e P
M2.
5 C
on
cen
trat
ion
in m
icro
gra
ms
per
cu
bic
met
er
24-Hour Average Standard65 micrograms per cubic
Dry Season
Rainy SeasonRainy Season
Dry Season
Annual Average Standard15 micrograms per cubic
AQMP, DOE
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Seasonal Variation of Particulate Matter in Dhaka City PM10 Trends in Dhaka City
Continuous Air Quality Monitoring Station
Sangsad Bhaban, DhakaPeriod: April, 2002 to April, 2006
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ms p
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mete
r
24-Hour Average Standard
150 micrograms per cubic
meter
Rainy Season
Dry Season
Rainy Season
Dry Season
Annual Average Standard
50 micrograms per cubic
meter
AQMP, DOE
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AQI Trends in Dhaka
AQI Trends in Dhaka Measured at CAMSApril,2002 to June,2003
0
100
200
300
400
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Date
AQI V
alue
Very Good Air Quality
Good Air Quality
Medium Air Quality
Bad Air Quality
Dry Days
AQMP, DOE
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Air pollution & health • High levels of outdoor air pollution have been
associated with short-term increases in asthma morbidity and mortality
• (AAPCEH 1993; Ostro et al. 2001; Tolbert et al. 2000). •
• Specific exposures to outdoor plant allergens such as organic dusts from castor beans, soybeans, and grains dramatically illustrate this relationship.
• (Etzel 2003)
• Ambient hazardous air pollutants, as well as industrial releases of aldehydes, metals, isocyanates, and others have been shown to cause and trigger asthma
• (Leikauf et al. 1995).
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Exchange of gases occurs in air sacs (alveoli)
lungs contain some 700 million alveoli which have a total surface area comparable to that of a tennis court.
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Health Impacts of Air Pollution
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Health Impacts of Air Pollution
•Mortality •Cardiopulmonary Hospitalizations•Emergency department or outpatient visits•Symptomatic exacerbations•Changes in lung function•Cardiopulmonary symptoms•Upper respiratory illnesses•Lower respiratory illnesses
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Asthma• Asthma is a common chronic
disorder in childhood• An asthma episode results in
narrowed airways following: – Swelling of the lining– Tightening of the muscle– Increased secretion of mucus in
the airway. • Children with asthma may
experience wheezing, coughing, chest tightness and trouble breathing, especially early in the morning or at night.
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Child hood Asthma
• The 3rd leading cause of hospitalization among children under the age of 15.
• one of the leading causes of school absenteeism• The annual direct health care cost poses huge economic
burden• Can be a life-threatening disease if not properly managed
among children.
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Other Effects of Air Pollution
• Immune System; Allergies• Allergic Asthma, Allergic Rhino-conjunctivitis• Extrinsic Allergic Alveolitis / Hypersensitivity
• Central Nervous System• Toxic Damage of Nerve Cells• Mental retardation
• Carcinogenic Effects• Lung Cancer, Leukemia
• Reproductive effects• Infant mortality, Low weight birth
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Health Effects of Air pollution in Dhaka City
• Child hood Asthma and ARI has increased significantly in Dhaka city
• 500,000 premature death & a million in the whole country become ill every year due to air pollution. About 15,000 premature death of children occurs in Dhaka city only (World bank estimate )
• 577,152 of respiratory disorders in a year of Bangladesh (DGHS report 2003)
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Health effect of PM
• Particulate emission is mainly responsible for increased death rate and respiratory problems for the urban population.
• PM2.5 particularly contributes in increasing deaths from cardiovascular and respiratory diseases and lung cancer.
• PM increases the risk of respiratory death in infants under 1 year, affects the rate of lung function development, aggravates asthma and causes other respiratory symptoms such as cough and bronchitis in children (Ostro B 2001)
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Health effect of PM......
• Increased PM2.5 concentrations increase the risk of emergency hospital admissions for cardiovascular and respiratory causes
• PM10 affects respiratory morbidity, as indicated by hospital admissions for respiratory illness.
• (WHO 1999, American Thoracic Society, 1996)
• Toxicity of particles may vary with composition . (Ghio AJ 2002, Pandya RJ 2002)
• Particle pollution contributes to excess mortality and hospitalizations for cardiac and respiratory tract disease.
(Schwartz J. 1994, Samet JM et al 2000)
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Children are more Vulnerable
• In children, particulate pollution affects lung function and lung growth.
(Ostro 2001, Yu O 2000, Gauderman 2000)
• Children have higher exposure to many air pollutants compared with adults because of higher minute ventilation and higher levels of physical activity.
(WHO1999. COEH 2004)
• Notable respiratory effects in children and adults– Asthma exacerbations– Decreased lung function.
(Gauderman 2000, ATS 1996)
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Rationale for the study
• There is no doubt that air pollution affecting human health in Bangladesh, especially in Dhaka City.
• Lack of formal studies showing the linkages between air pollution concentration and health impacts in most Asian countries as well as in Bangladesh.
• Current effort attempted to provide evidence on impact of air pollution among school children of Dhaka City .
• Under the Malé Declaration sub-activity 4.1.2 'Measuring health effects of air pollution through cohort, time-series or cross-sectional studies‘.
• Assessment of impact of air pollution among school children in selected schools of Dhaka City has been decided to undertaken
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Stakeholders
The Study was initiated jointly by • United Nations Environment Program (UNEP)• RRCAP• Stockholm Environment Institute (SEI) of Sweden, • Department of Environment (DoE)• Department of Occupational & Environmental
Health (DOEH) of NIPSOM
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Objective of the study
To explore whether air pollution in terms of the concentrations of particulates is related to respiratory symptoms and lung function (PEFR) in children in Dhaka City.
The findings of the study was expected to address uncertainties and strengthen inferences of causality and to develop a dose-response association.
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Phases of the study
Current study consists of two componentsPhase I: Baseline SurveyPhase II: Health impact study
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Methods • Base survey was conducted in 3 schools of Dhaka
City & within 1 Km of Air Quality Monitoring Station of DoE• Dhanmondi Boy’s School (DBS),• Tejgaon Girl’s School (TGS)• Civil Aviation School (CAS).
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PM Sampling station & Health impact study area
CMS
Study Area Schools
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Study place
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Methods • AQMP data of the place was considered as representative of
the air quality state of the selected schools.
• All students of class V, VI, VII, VIII & IX of these schools were targeted as participants for the baseline survey.
• N= 1800 and age range was from 9-16 years
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Data collectionData collection instrument Bengali version of ISAAC (International Study of Asthma and Allergies in Childhood) questionnaireHealth & Medical history check list
The Questionnaire consisted 3 parts: Part-I : Introductory information. Part II: Socioeconomic dataPart-III : Respiratory health related data.
Data collection ProcedureThe questionnaire was delivered to all the students to fill in with the assistance of their parents. Present health state and medical history were recorded in Check list by medical personnel
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Anthropometric data collection
• Health check up by doctors using check list
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Response rate In Phase I
• Out of the 1800 targeted students
• 1618 students ultimately submitted the filled in questionnaire and were considered as participants of the study.
• The response rate was around 80%. • To encourage responses and to achieve targeted 80%
response rate for base line data, every respondent who returned the filled in questionnaire was given a token prize (e.g. Pencil box or Geometry Box or Pen set).
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Recruitment of asthmatic childrenFor Phase II
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Sample size
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Study period
Week January February March April May June July
1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4
1st
2nd
3rd
4th
5th
6th
Additional 1 week data were collected on November 07
•Data collection was planned during the peak dust periods of dry season. •Typically in Bangladesh the dry period starts in November.•During the period of November to February the dust level usually remains high com
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Exposure assessment
Particulate material and weather condition were considered as exposure
Particulate data collected from the Air Quality Management Project (AQMP)• PM10 and PM2.5 Level of relevant period was
Metrological data from the Department of Metrology • Temperature : maximum, minimum and average • Relative humidity: Maximum, minimum & average• Wind speed
Exposure and outcome data were taken on same day for correlation
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Outcome Measures
Lung function tests: Lung function tests evaluate how well lungs work. • The tests determine how much air lungs can hold• How quickly one can move air in and out of lungs• How well lungs put O2 into and remove CO2 from
blood. Spirometry • Forced vital capacity (FVC)• Forced expiratory volume (FEV).• Peak expiratory flow (PEF)• Maximum voluntary ventilation (MVV)• Total lung capacity (TLC)• Functional residual capacity (FRC)• Expiratory reserve volume (ERV)
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Peak Expiratory Flow Rate (PEFR)
• PEFR measures maximum flow rate of expired air.
• That is how quickly one can exhale.
• This is a simple method of measuring airway obstruction
• The simplicity of the method is its main advantage. • Peak flow measurement using a peak flow meter is
particularly useful for individuals with asthma.
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Outcome Measurement
• PEFR was measured twice per day • Once in the morning shortly
before the classes began Again when the classes for the day ended.
• Morning measurements were recorded before taking of any airway medication.
• Each measurement was replicated three times in the standing position, and the highest reading was recorded.
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Statistical analysis
• A variety of statistical tests were used including:• chi-square tests to evaluate group data• t-test & ANOVA to test the difference between
group means • Correlation analyses • Regression analyses • Repeated measures analyses
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Selected Socio demographic status of School Children
Class Gender No Mean age (±SD)
Class VMale 206 10.25 (±0.86)
Female 212 10.40 (±0.89)
Class VIMale 124 11.10 (±0.93)
Female 223 11.26 (±0.82)
Class VIIMale 102 12.20 (±0.82)
Female 165 12.28 (±0.78)
Class VIIIMale 98 13.11 (±0.90)
Female 191 13.05 (±0.71)
Class IXMale 109 13.80 (±0.89)
Female 188 13.73 (±0.75)
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Socio- demography
Age of the study participants ranged from 9 to 16 years.
The groups were found to be similar in terms of gender, age, academic level.
The two groups assumed to be homogenous with respect to the socio- demographic variables.
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Respiratory Problems 1
Respiratory Problems Response No. %
Wheezing sound in respiration yes 268 19.6
no 1101 80.4
Sound in respiration in last 1 year
yes 158 59.0
no 110 41.0
No. of attacks of wheezing in past 1 year
1-3 times 126 79.7
4-12 times 24 15.2
>than 12 times 08 5.10
no 999 73.6
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Respiratory Problems 2
Respiratory Problems Response No. %
Sleep disturbed for wheezing
> Once/wk 31 19.6Once/wk 64 40.5
never 63 39.9Severe wheezing yes 67 42.4
no 91 57.6Child suffered from asthma yes 235 16.5
no 1190 83.5Chest sounded wheezy during or after exercise
yes 114 8.20
no 1282 91.8Cold cough at night yes 358 26.4
no 999 73.6
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Respiratory Problems not due to general cold/fever
Respiratory Problems not due to flu
Response No. %
Ever sneezing not due to general cold/fever
yes 567 40.6no 829 59.4
In last 1 year sneezing not due to general cold/fever
yes 486 85.7
no 81 14.3
Eye itching with nose problemyes 346 71.2no 140 28.8
Study and play disturbed in last year
most disturbed 9 1.90
much disturbed 38 8.00little 269 56.4never 161 33.8
Allergy related feveryes 172 12.5no 1208 87.5
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Non Respiratory Allergic symptomsOther Allergic symptoms Response No %Frequent rash in last 6 months Yes 267 20.2
No 1052 79.8Rash at least once in last one year
Yes 241 90.3No 26 9.7
Rash in elbow, knee, heel, throat, eye, ear
Yes 170 68.3No 79 31.7
Rash automatically cured in last one year
Yes 153 62.2No 93 37.8
Night sleep disturbed for rash in last one year
> once/week 41 15.8once /week 66 25.4
Never 153 58.8Child suffered from eczema
Yes 136 9.7No 1259 90.3
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Smoker in Households
Smoking status N % TotalAny smoker among the house hold
Yes 574 39.8 1443(89.2%)No 869 60.2
Do they Smoke in the house
Yes 285 49.7 574 (39.8%)No 289 50.3
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Asthma Status of Children
Asthma diagnosed by
study physician
Child ever suffered from Asthma
Total Yes No
Yes 234 (63.6%) 134 (36.4%) 368 (25.8)No 1 (0.1%) 1056 (99.9%) 1057 (74.2)
Total 235 (16.5%) 1190 (83.5%) 1425 (100.0)
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Anthropometry
Variables of interest
Asthma status
Mean SD t- value
P value
95% CI
Height No 149.17 10.548
-0.564 0.573 -4.1 – 2.3 Yes 150.07 09.857
Weight NO 45.53 12.213
0.022 0.982 -3.6 -3.7 Yes 45.49 11.586
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PM 10 and PM 2.5
• Mean PM 10 concentration 119 µg/m3 (38 to 385 µg/m3 )
• Mean PM 2.5 concentration 67 µg/m3 (18 to 233 µg/m3 ) (Standard PM10 level of 150 µg/m & Standard PM2.5 of 65
µg/m3)
• Mean PM 10 concentration 119 µg/m3 (38 to 385 µg/m3 )
• Mean PM 2.5 concentration 67 µg/m3 (18 to 233 µg/m3 ) (Standard PM10 level of 150 µg/m & Standard PM2.5 of 65
µg/m3)
4037343128252219161310741
Mea
n D
aily
ave
rage
co
ncen
trat
ion
of P
M2.
5
300
200
100
0
Data Collection Days Data collection
Days
4037343128252219161310741
Mea
n D
aily
ave
rage
co
ncen
trat
ion
of P
M10
500
400
300
200
100
0
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Humidity
• Average Low Humidity was found in first 11 days of study period which was 48-59 %.
• After that the average humidity was increased and it was highest (98%) on 21th and 32nd day.
• Average Low Humidity was found in first 11 days of study period which was 48-59 %.
• After that the average humidity was increased and it was highest (98%) on 21th and 32nd day.
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Temperature
Average Low Temperature was observed during first 10 days which was 22-240C and the Lowest Temperature was 15.80C on 8th day.
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PM 10 &
Morning PEFR
Asthma
Non Asthma
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PM10 and Morning PEFR
PM10 accounted for 58.4% variance of Morning PEFR (F= 2624.20; P= <0.001)
Morning PEFR decreased by 37.60% in both asthmatic & non-asthmatic children from lowest to the highest PM10 Level.
PM10 accounted for 58.4% variance of Morning PEFR (F= 2624.20; P= <0.001)
Morning PEFR decreased by 37.60% in both asthmatic & non-asthmatic children from lowest to the highest PM10 Level.
385
253
211
164
154
133
128
122
118
111
90
88
82
76
64
57
51
38
M-
PEFR
(L
/min
)
500
400
300
200
Status of Asthma
No asthma
With Asthma
PM10 (µg/m3)
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PM 10 &
Afternoon PEFR
Asthma
Non Asthma
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PM 10 & Afternoon PEFR
PM10 concentration accounted for 60.9% variance of the afternoon PEFR (F=2913.29; p= <0.001).
A 41.87% reduction of afternoon PEFR was observed due to change from the lowest to the highest level of PM10 concentration.
PM10 (µg/m3)
385253
211164
154133
128122
118111
9088
8276
6457
5138
A-P
EFR
(L
/min
)
500
400
300
200
100
Status of Asthma
No asthma
With Asthma
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PM 2.5 &
Morning PEFR
Asthma
Non Asthma
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PM 2.5 & Morning PEFR
PM2.5 concentration accounted for 48.7% of the variance in afternoon PEFRMorning PEFR decrease by 30% with an increase of PM2.5 concentration from lowest to highest.
PM2.5 (µg/m3)
233
155
141
108
99
92
76
62
58
54
44
40
35
32
30
26
24
18
Mor
ning
PE
FR (
L/m
in)
500
400
300
200
Status of Asthma
No asthma
With Asthma
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PM 2.5&
Afternoon PEFR
Asthma
Non Asthma
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PM 2.5 & Afternoon PEFR
PM2.5 concentration alone accounted for 50.50% variance of the afternoon PEFR (F=1910.51; p= <0.001). A 33.85% reduction of afternoon PEFR was observed due to change from the lowest to the highest level of PM2.5 concentration.
PM2.5 (µg/m3)
233
155
141
108
99
92
76
62
58
54
44
40
35
32
30
26
24
18
Aft
erno
on P
EFR
(L
/min
)500
400
300
200
100
Status of Asthma
No asthma
With Asthma
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PEFR Change &
PM10 and PM2.5
PEFR decreased by about 40% in both asthmatic and non-asthmatic children when PM10 increased from its lowest level of 38 µg/m3 to its highest daily mean of 385 µg/m3.
PEFR decreased by about 30% in both asthmatic and non-asthmatic children when PM2.5 increased from its lowest level of 18 µg/m3 to its highest daily mean of 233 µg/m3.
PM10 (µg/m3)
385253
211164
154133
128122
118111
9088
8276
6457
5138
Dif
fere
nce
PEFR
(L
/min
)
30
20
10
0
Status of Asthma
No asthma
With Asthma
PM2.5 (µg/m3)
233155
141108
9992
7662
5854
4440
3532
3026
2418
Dif
fere
nce
PEFR
(L
/min
)
30
20
10
0
-10
Status of Asthma
No asthma
With Asthma
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PEFR difference & temperature & humidity
PEFR change in both the asthmatic & non-asthmatic children is related to rise in temperature and humidity.
PEFR increased by about 40% if average humidity rises from 60% to 90%.
Daily average temperature in 0C
30.1229.72
28.7028.31
28.0627.79
27.1826.24
25.3924.93
24.3323.14
22.4521.13
Dif
fere
nce
PEFR
(L
/min
)
30
20
10
0
-10
Status of Asthma
No asthma
With Asthma
89.1783.46
82.0079.21
77.8876.46
75.7171.58
68.6367.00
61.7559.08
57.1348.88
Dif
fere
nce
PEFR
(L
/min
)
30
20
10
00
-10
Status of Asthma
No asthma
With Asthma
Average humidity in %
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Temperature and Humidity
The Temperature and Humidity were also independently affecting the Morning, Afternoon and Difference PEFR with statistical significance.
After removing the effect of temperature and humidity, the PM10 and PM2.5 concentrations were alone significantly influencing the Morning, Afternoon and Difference PEFR.
After removing the effect of PM10 and PM2.5 it was observed that humidity could also significantly influence the Morning and Afternoon PEFR with a positive direction but humidity could not affect the Difference PEFR.
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Total Expenditure for respiratory problem
Respiratory Problems
Mean (±SD)-Taka Min Max Significance
No asthma (35) 3478.86 (±4171.34) 200 19000 F=-21.6, P<0.001
With Asthma (73) 6918.68 (±3315.18) 1411 17200
Total (108) 5803.43 (±3942.15) 200 19000
Total annual expenditure for respiratory illnesses of asthmatic children (6918 Taka, about 100 USD) was twice the expenditure of non-asthmatic children (3478 Taka).
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Limitations of the current study • A limitation of this study that is shared by all other such studies is
that the ambient pollution concentrations may not adequately reflect exposures of individual subjects.
• Since most of a child's time during a school year is spent indoors, and since indoor pollutant concentrations, and particulates, can be markedly different from those outdoors, the outdoor concentrations measured in this study may not have been valid estimates of each subject's exposure.
• Another weakness of this study is that PEFR is primarily a measure of large airways function. Thus, to the degree to which the anticipated effect is due to small airways abnormalities, PEFR may not be a sensitive measure of pulmonary function decrement due to air pollution.
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Limitations of the current study • Despite these limitations the findings of the current study is
indicative that air pollution especially the particulates (both PM10 and PM2.5) are adversely affecting the respiratory health of the children in Dhaka, Bangladesh, and those having adverse lung conditions like asthma are being more affected than healthy children
• The data was planned to collect in the peak dry season however some of the data collected days were not dry days. Additional 7 days of data were collected to counter the limitation. However collection of data on non dry days might hamper the generality of the study findings.
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The pollutants load, both PM10 and PM2.5, in the air and the humidity level of Dhaka city is quite high.
PMs were found to be associated with adverse respiratory health in both asthmatic and non-asthmatic children
Among the them PM10 is more significantly associated with worsening of asthma.
These factors particularly PM10 concentrations are also detrimentally affecting the respiratory health of the non-asthmatic children of Dhaka city .
Cost for the management of respiratory problems have adverse economical implication at the family and in turn on the national economy.
Conclusion
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Air pollution should be paid due attention as an important cause of morbidity and mortality and should be regarded as an economic burden to the nation.Major causes and sources of air pollution especially the particulate matter should be addressed with control measures.School health program with especial emphasis on respiratory health problems should be strengthened. Further study should be conducted to identify the specific pollutants which are mostly contributing towards adverse effects on respiratory health.
Recommendations
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• Number of registered vehicles, 1999 to 2003-04. http://www.sdnpbd.org/sdi/issues/environment/data/atmosphere/number_registered_vehicles99_2003_04.pdf
• http://www.sdnpbd.org/sdi/issues/environment/data/atmosphere/air_quality_CO.pdf
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• Monthly ambient air quality status (SO2 and NOx) of Dhaka city at Sangsad Bhaban, 2003. http://www.sdnpbd.org/sdi/issues/environment/data/atmosphere/air_NOx.pdf
• Monthly ambient air quality status (CO) of Dhaka city at Sangsad Bhaban, 2003. http://www.sdnpbd.org/sdi/issues/environment/data/atmosphere/air_quality_CO.pdf
• Monthly ambient air quality status (O3) of Dhaka city at Sangsad Bhaban, 2003. http://www.sdnpbd.org/sdi/issues/environment/data/atmosphere/air_quality_O3.pdf
• Monthly ambient air quality status (PM10 and PM2.5) of Dhaka city at Sangsad Bhaban,2003. http://www.sdnpbd.org/sdi/issues/environment/data/atmosphere/air
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Question & AnswerQuestion & Answer