health and biomass cookfuels
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Health and Biomass Cookfuels
Kirk R. Smith, MPH, PhD
Professor of Global Environmental Health
University of California, Berkeley
Fulbright-Nehru Distinguished Chair
IIT-Delhi – 2013/14
WHO SEAR Meeting
Sri Lanka, March 20, 2014
Important Paper Published!
Conclusions
• A high incidence of cor pulmonale was noted in Delhi in
an entirely nonindustrial population. [Even though
smoking much more] (m)en were only slightly more
affected than women and there was a preponderance of
rural over urban cases.
• The patients were comparatively young ,…. And presented
with very florid signs of congestive heart failure on their
first visit to hospital.
Etiology Speculation
• In the rural and semirural areas, the houses were mostly 1-
or 2-roomed mud huts in which several members of the
family lived together. There was no outlet for smoke with
the result that the house was filled with smoke when the
family meal was cooked.
• The fuel used almost universally is cow dung which is
dried into flat cakes for this purpose. Probably from
inadequate combustion, it emits a lot of smoke.
Did you notice this paper when it
came out?
• Probably not, since it was 54 years ago!
• Circulation. 1959; 20:343-352
• Pioneering study, excellently done, and
published a major journal, but
• Little notice and no serious work initiated
except a few sporadic case accounts for the
next 20+ years
• Next serious health publications by Dr.
M,R, Pandey in Nepal in the early 1980s
Road Map
• Brief summary of health evidence for the
region using the environmental health
pathway
• And history of biomass use in the region
• What has been done to deal with the issue,
which is mainly improved biomass stoves
• And what is possible outside the
mainstream approach: clean fuels
The Environmental Health Pathway
The three major solid fuels
Leading cause of disease burden in 2010 by countryPopulation Cooking with Solid Fuels in 2010 (%)
1990:
85%: 700
million people
using solid fuels
2010:
60%: 700
million people
~1980
700 million
people
in entire country
700 million
people in the
Chulha Trap
South East Asia
Africa
Western Pacific
World
Eastern Mediterranean
Americas
Europe
83
82
48
66
53
27
22
77
61
46
41
35
14
7
62
87
82
95
60
42
38
02
04
06
08
01
00
Pe
rcen
tage
of po
pu
lation
usin
g s
olid
fue
ls (
%)
1980 1990 2000 2010year
Percent of households cooking with solid fuels by region
Bonjour et al., GBD-2010
0500
1,0
00
1,5
00
2,0
00
Popula
tion (
mill
ions)
AfricaAmericas
Eastern MediterraneanEurope
South East Asia Western Pacific
1980
1990
2000
2010
1980
1990
2000
2010
1980
1990
2000
2010
1980
1990
2000
2010
1980
1990
2000
2010
1980
1990
2000
2010
Primarily using solid fuels Primarily using non-solid fuels
02,0
00
4,0
00
6,0
00
8,0
00
World
1980
1990
2000
2010
Total Population Cooking with Solid FuelsBonjour et al., CRA-2010
SEAR Households Cooking with Solid Fuel
1990 2010
Timor-Leste 96% (82, 100) 92% (79, 100)
Myanmar 98 (89, 100) 92 (79, 100)
DPR of Korea 98 (85, 100) 91 (78, 100)
Bangladesh 91 (78, 100) 91 (78, 100)
Nepal 74 (61, 88) 82 (69, 95)
Sri Lanka 89 (76, 100) 75 (62, 88)
India 87 (73, 99) 58 (45, 71)
Indonesia 67 (53, 81) 55 (42, 68)
Bhutan 78 (65, 93) 40 (27, 53)
Thailand 63 (50, 77) 26 (13, 39)
Maldives 64 (15, 78) 8 (0, 22)
The Environmental Health Pathway
Or, since wood is mainly just carbon, hydrogen, and oxygen,
doesn’t it just change to CO2 and H2O when it is combined
with oxygen (burned)?
Reason: the combustion efficiency is far less than 100%
Woodsmoke is natural – how can it hurt you?
Toxic Pollutants in Biomass Fuel Smoke
from Simple (poor) Combustion
• Small particles, CO, NO2
• Hydrocarbons
– 25+ saturated hydrocarbons such as n-hexane
– 40+ unsaturated hydrocarbons such as 1,3 butadiene
– 28+ mono-aromatics such as benzene & styrene
– 20+ polycyclic aromatics such as benzo(α)pyrene
• Oxygenated organics
– 20+ aldehydes including formaldehyde & acrolein
– 25+ alcohols and acids such as methanol
– 33+ phenols such as catechol & cresol
– Many quinones such as hydroquinone
– Semi-quinone-type and other radicals
• Chlorinated organics such as methylene chloride and dioxin
Source: Naeher et al,
J Inhal Tox, 2007
Typical chulha releases
400 cigarettes per hour
worth of smoke
The Environmental Health Pathway
Health-Damaging Air Pollutants From
Typical Wood-fired Cookstove.
10 mg/m3
Carbon Monoxide:150 mg/m3
0.1 mg/m3
Particles3.3 mg/m3
0.002 mg/m3
Benzene0.8 mg/m3
0.0003 mg/m3
1,3-Butadiene0.15 mg/m3
0.1 mg/m3
Formaldehyde0.7 mg/m3
Wood: 1.0 kgPer Hour
in 15 ACH40 m3 kitchen
Typical Health-based
Standards Typical Indoor
Concentrations
Best single indicator IARC Group 1 Carcinogens
The Environmental Health Pathway
First person in human history to
have her exposure measured
doing the oldest task in human history
Kheda District,
Gujarat, 1981
Emissions and
concentrations,
yes, but
what about
exposures?~5000 ug/m3
during cooking
>500 ug/m3 24-
hour
How much PM2.5 is unhealthy?
• WHO Air Quality Guidelines
– 10 ug/m3 annual average
– No public microenvironment, indoor or
outdoor, should be more than 35 ug/m3
• National standards – annual outdoors
– USA: 12 ug/m3
– China: 35 ug/m3
– India: 40 ug/m3
CRA published along with the other
GBD papers on Dec 14, 2012
in The Lancet
Annual Review of Public Health,
vol 35, 2014, to be published in March
Definitions
• Global Burden of
Disease (GBD)
• Envelope of death,
illness, and injury by
age, sex, and region.
• Coherent – no overlap
– one death has one
cause
• Comparative Risk
Assessment (CRA)
• The amount of the
GBD due to a
particular risk
factor, e.g. smoking
• Not coherent –
deaths can be
prevented by
several means
Metrics
• Mortality – important, but can be
misleading as it does not take age into
account or years of illness/injury
– Death at 88 years counts same as at 18, which
is not appropriate
• Disability-adjusted Life Years (DALYs)
lost do account for age and illness.
• GBD 2010 compares deaths against best life
expectancy in world – 86 years
GBD: Lost Life Years for India
1990 2010
Comparative Risk Assessment Method
Exposure Levels:
Past actual and past
counterfactual
Exposure-response
Relationships (risk)
Disease Burden
by age, sex, and region
Attributable Burden by age, sex, and region
State-wise
estimates of
24-h kitchen
concentrations
of PM2.5
in India
Solid-fuel using
households
Balakrishnan et al.
2013
Diseases for which we have
epidemiological studies ALRI/
Pneumonia
COPD
Lung cancer(coal)
Cataracts
Lung cancer(biomass)
These diseases are included in the
2010 Comparative Risk Assessment (released in 2012)
Ischemic
heart disease
Stroke
Study design N* OR 95% CI
Intervention 2 1.28 1.06, 1.54
Cohort 7 2.12 1.06, 4.25
Case-control 15 1.97 1.47, 2.64
Cross-
sectional
3 1.49 1.21, 1.85
All 26 1.78 1.45, 2.18
Dherani et al Bull WHO (2008)
Top 15 causes of ill-health in India (GBD/CRA 2010)
HAP Total: ~1,000,000 premature deaths annually
Women and Girls Men and Boys:
CRA results from
GBD 2010:
Ranking Household Air
Pollution
(HAP) across regions
In country ranking for HAP • Highest attributable disease burdens from
HAP are in South Asia and Africa
• HAP also among the highest ranking
risk factors* in many countries
*among those examined
Lim et al, Lancet 2012
GBD-2010
Framing.
• Not called “indoor” because stove smoke
enters atmosphere to become part of general
outdoor air pollution (OAP)
• HAP contributes about 13% to OAP
globally, but much more in some countries
• ~25% in India
• Thus, part of the burden of disease due to
OAP is attributable to cooking fuels in
households
Satellite-based ambient PM2.5
van Donkelaar et al, EHP 201045
%PM2.5 from “Residential” Emissions from INTEX_B
46Source: Asian Emission Inventory for NASA INTEX_B 2006 (accessed 2010) Chafe, 2010
25-30% of
primary
particle
pollution in
India is from
household
fuels
C. Child
ALRI
17,139,800
DALYs
B. Female
IHD
9,092,910
DALYs
A. Male IHD:
17,102,900
DALYs
India:
IHD and
child ALRI
Summary
• One of the top risk factors in the world for ill-health.
• Biggest impact in adults --3 million premature
deaths (two-thirds the DALYs)
• Still important for children ~500,000 deaths (one-
third the DALYs)
• Biggest single risk factor of any kind for South
Asian women and girls
• Important source of outdoor air pollution
• Impact going down slowly because background
health conditions improving
• Actual number of people affected is not going down
What can be done?
Indian Population in 2010
??
Heart Disease and Combustion Particle Doses
HAP
Zone
From “Mind the Gap,”
Smith/Peel, 2010 and Pope
et al., 2009
Integrated Exposure-Response:
Ischaemic Heart Disease
HAP
Zone
CRA,
2011Outdoor Air
Pollution
Secondhand
Tobacco Smoke
Smokers
Stroke
Ischaemic Heart Disease
ALRI
ug/m3 annual average PM2.5
COPDLung Cancer
Public health and environment 55555555|
Exposure-response relationship
Risk
PM2.5 Exposure
O/Fire‘ChimneyRocketLPG
3
1
125 200 300 µg/m325
Fan
2
WHO air quality
annual
guideline:
10µg/m3
IT1 : 35 µg/m3
Child pneumonia
Leaves ~80% of
burden
untouched
Can we get
here?
How close to clean enough?
• New WHO Indoor Air Quality Guidelines
will be about 0.9 mg/min PM2.5 to protect
~80% of households at AQG-IT1, 35 ug/m3
• Cleanest biomass blower stove tested by the
USEPA is about 8 times more polluting in
lab.
• But does not achieve this over time in the
field
• Need to push harder to find ways to make
biomass burn cleanly in inexpensive devices
The Energy Ladder: Relative Pollutant
Emissions Per Meal
0.1
1.0
10.0
100.0
CO Hydrocarbons PM
CO 0.1 1.0 3 19 22 60 64
Hydrocarbons 0.3 1.0 4.2 17 18 32 115
PM 2.5 1.0 1.3 26 30 124 63
Biogas LPG Kerosene Wood RootsCrop
ResiduesDung
Smith, et al., 2005
“Clean” “Dirty”
?
First person in human history to
have her exposure measured
doing the oldest task in human history
Kheda District,
Gujarat, 1981
Emissions and
concentrations,
yes, but
what about
exposures?
In the 1980s, the first link to air
pollution science
Field Team, Gujarat, 1981
Diwaliben, October 2013
Gujarati Villages since 1981
• Reliable electricity
• Piped water
• Cell phones
• Satellite TV
• Pucca schools
• More pucca houses and roads
• In spite of 3-5 “improved” biomass stove
programs since the 1970s – none now in
existence
• Chulhas in every house
Smith, et al., 1983
Assessment of “Improved Stoves”
What is an induction cookstove?• Electric, yes, but
• Entirely different technology from
traditional electric stoves – high frequency
magnetic field induces heat in pot alone
• More efficient ~90% instead of ~60%
• Faster cooking >1.5x
• Safer – surface is warm but does not burn or
cause fires
• Long-lived, easy to clean, sophisticated
controls if desired
- - Bajaj Electrical Ltd.
- Compton Greaves Ltd.
- Eurolux
- Glen Appliances Pvt. Ltd.
- Inalsa
- Jaipan Industries Ltd.
- Kenwood Ltd.
- Khaitan Electrical Ltd
- Morphy Richards
- Panasonic Corp.
- Phillips
- Preethi Kitchen Appliances, Ltd.
-Sunflame
-TTK Prestige Ltd.
-Usha International Ltd.
-Westinghouse
Induction Cooktop
Market in India
2012-2016
Published: March 2013
Infiniti Research Limited
35.4% per year growth
predicted: 2012-2016
Factor of nearly
five increase!
Flying off the shelves in China
?
Increasing Prosperity and Development
De
cre
asi
ng
Ho
use
ho
ld A
ir P
oll
uti
on
Very Low
Income
200 million
Low Income
400 million
Middle Income
400 million
High Income
200 million
Crop
Waste
Dung
Coal
Kerosene
Natural Gas
Electricity
Non-solid fuels
Solid Fuels
Liquefied Petroleum Gas
Biogas
Wood
Conceptual Indian Energy Ladder
?
Bottom line
–In addition to continuing to try to
Make the available clean–Shouldn’t the health community
also try harder to help
Make the clean available?
India: What If?Millions
9% instead
of 5.5%/yr
for 20 years
A Chulha Trap
or a
Clean Fuel Gap?
Costs are Large
• 100 million households
• @ 12,000 INR/year LPG cost
• Including stove amortization
• Is 120k crore
• A big number!
• But far smaller than the benefits
Benefits
• Indian per capita income per DALY
saved—reduced by 50% due to lags
• One work day (10 hours) a week saved
labor at rural employment scheme wage
(100 INR/day)
• Outdoor particle air pollution reduction at 1
lakh per ton
• Carbon market at 600 INR/ton carbon
Economics: Benefits
Benefits:
$50 billion
for 100
million
households
Costs:
20 billion US
for 100
million
households
Challenge
• How to balance the costs with the benefits?
• Which accrue to different groups?
• And do so in a politically and economically
sustainable model?
• Lessons to learn from other health
interventions?
• Approaches to link energy sector to health
sector?
How do we help
people move into
this realm?
HAP Interventions
• Move aggressively to ban coal and kerosene
in household use
• Aggressively expand access to LPG and
other clean fuels
• Expand and stabilize household electricity
access – pick off cooking tasks with electric
appliances
• Develop and deploy very clean biomass
stoves – none yet available at scale,
however
SEAR Target
• 50% reduction in the proportion of
households using solid fuels by 2025
• Achievable?
http://www.indiaenergy.gov.in/
Energy Scenarios Website Launched
By Planning Commission (March 2014)
2012 2027-base 2027-aspirational
LPG 32% 33% 41%
Electricity
0.10% 1% 7%
PNG 0.3% 6% 16%
Biomass 64% 55% 32%
Coal 1.4% 1% 1%
Kerosene 2.5% 2% 3%
Biogas 0.3% 1% 1%
Total 100% 100% 100%
India’s Planning Commission Trajectory 4
(aspirational) for Household Cooking
Meets SEAR Target!!
Bottom line for SEAR• HAP target is probably achievable in India.
• But will take much effort to do so
• WHO should push the agencies – focus on
potential for major health improvement
• But this will still leave ~50% of rural
households with dirty fuels in 2025
• Perhaps something even more ambitious
might be considered?
UN SE4All
• The UN’s Sustainable Energy for All
Initiative is even more ambitious
• Which is 95% of households using modern
cooking fuels by 2030
EHP, 2007
EHP, 2011
EHP, 2011
Many thanks
Publications and
presentations on website
– easiest to just
“google” Kirk R. Smith
Questions for consideration
• What are the full benefits of reliable
electricity?
• Is there a leapfrog cooking technology that
would
– Be clean, efficient, and safe
– Sufficiently transformational to “sell
itself” and rapidly take over the market
New Partners in India
• Ministry of Health and Family Welfare
– First MOH in world to take on reducing HAP
as a major goal. First meeting of steering
committee next week to design program
• Ministry of Petroleum/Natural Gas
– MOP/NG considering expansion of LPG as a
health priority, potentially in conjunction with
MOH. First meeting next week
• Ministry of Power:
– working to bring them on board through the
Bureau of Energy Efficiency
Not all diseases included
• Many with evidence not included yet
– Low birth weight
– TB
– Other cancers – cervical, upper respiratory, etc
– Cognitive effects
– Pneumonia in adults
• Can expect that HAP effects, over time, will
be found for nearly all the many dozen
diseases found for smoking.
• But at lower risk levels
Biggest impacts from smoking
• Lung cancer
• Heart disease of various kinds
• Chronic obstructive lung disease
• Stroke
• Same adult impacts as HAP
What other cancers from smoking?
• “Traditional” smoking cancers: oral cavity,
pharynx, larynx, oesophagus, pancreas,
urinary bladder, and renal pelvis
• Newly confirmed cancers: nasal, sinus,
nasopharynx, stomach, liver, kidney, uterine
cervix, oesophagus, and leukaemia
Review of Epi Evidence: Lung Cancer, 2004
Birth defects due to smoking in
pregnancy include
• cleft lips and cleft palates,
• neural tube defects
• shortened or missing arms and legs,
• gastrointestinal abnormalities,
• being born with their intestines hanging outside the body
• heart defects
• baby boys born with undescended testes.
Human Reproduction Update, 2009
Infectious disease and smoking
• pneumonia
• TB
• meningococcal disease
• otitis media
• influenza
Archives of Internal Medicine, 2004
Other impacts of smoking
• preterm delivery,
• stillbirth,
• low birth weight, and
• sudden infant death syndrome (SIDS)
• lower bone density in older women.
• cataracts
• IQ and cognitive impacts (SHS)
CDC, 2012
Bottom Lines
• We understand the risks of combustion particles not only from a large number of studies in households, but also from studies of outdoor air pollution, secondhand smoke, and active smoking.
• Over time, we can expect that nearly every effect found in smokers will be found from household smoke, but a lower risk levels.
• We no longer refer to it as “indoor” air pollution because the exposures occur not only inside, but around the house, down the street, and indeed regionally – “secondhand cook smoke”
• Cannot solve outdoor air pollution problems in South Asia and other regions without reducing substantially household pollution.
Just because we know it’s a risk,
does not mean we know how to fix it
• 1964: Surgeon General’s Report but Framework
Convention on Tobacco Control was 2005 and not
all countries yet signed up and impacts growing
• ~1900: Mosquito-born disease cause established,
but still 1.4 million die of malaria today
• ~1890: causation of health risk from human waste
in drinking water firmly established: still today
one-third of world population without adequate
sanitation/water
Why is it so hard?
• What we know works, gas and electricity, is not “affordable” by the poor.
• Other technologies difficult and less effective and no drug companies to pay for their advancement
• Particularly difficult because of the high component of behavioral change required
• Yet, the fact that 60% of the world is now protected, gives us reason to think we can protect the other 40%
• Will take a new type of research and development, however, both sophisticated and rigorous, to develop and test the interventions in ways to convince the health community
• And completely different levels of funding, for example the kinds of large intervention trials done for vaccines, water/sanitation, bednets, etc. – $10s of millions each
If it doesn’t take fifty years,
it isn’t worth doing.*
• Let us hope, however, that in 2030 we are
not like poor water/sanitation today, i.e.,
120 years from when causation was
accepted by most people, but still killing
millions annually.
*Attributed to Albert Einstein
New WHO AQGs Will Play an
Important Role in this Future
• By indicating in an authoritative way what is clean enough to protect health.
• For example, it will help the new Indian National Cookstove Initiative to operationalize its far-sighted vision for all Indian households:
• “Our aim is to achieve the quality of energy services from cookstoves comparable to that from other clean energy sources such as LPG.”
– Ministry of New and Renewable Energy, 2009
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