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Transportation-related Air PollutantsHealth Effects and Risk
Linda Tombras Smith, PhDChief, Health and Exposure Assessment BranchResearch Division
October 21, 2013
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How Are Regulations Developed and Prioritized? Law
The authority given to Air Resources Board by legislature and US Congress
Policy Set by legislature and Governor Prioritizing regulations
Science/Public Health Chemical’s concentration in air Number of people exposed Chemical toxicity
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Focus: Public Health and Relative Risk
Law The authority given to Air Resources Board by
legislature and US Congress Policy
Set by legislature and Governor Prioritizing regulations
Science/Public Health Chemical’s concentration in air Number of people exposed
At risk populations (children, elderly, poor, minority)
Chemical toxicity Cancer and other health risk Copollutants 3
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Major Transportation-related Air Pollutants of Concern
Criteria pollutant precursors Atmospheric processes with motor vehicle
emissions leading to PM2.5, Ozone Diesel PM
Listed as a TAC and a component of PM2.5 Near roadway pollutants
Black carbon, NOx, ultrafine PM Air Toxic Contaminants (TACs)
Benzene, 1,3-butadiene, and others gaseous pollutants
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PM2.5, Ozone – Regional Pollutants
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Ambient Air Quality Standards
Ozone 1hr
Ozone 8h
PM2.5 24hr
PM2.5 annual
PM10 24hr
PM10 annual
0
50
100
150
200
µg/m
3
India WHO United States California6
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Premature death Causal for cardiopulmonary disease (US
EPA) Hospital admissions for exacerbation
of pre-existing respiratory and cardiac problems
Emergency room visits for asthma Reduced lung function in children
Increased risk of bronchitis and chronic cough
Exposure during pregnancy - low birth weight, premature birth, and birth defects
Health Effects of PM2.5 Exposure
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Populations Most at Risk: PM2.5
Older adults People with chronic heart
or lung disease Children
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Quantifying Health Impact of PM2.5 Exposure – Premature Mortality
Air Quality Monitoring/Modeling Concentration-Response Relationship
Epidemiological Studies Population Demographics Incidence Rates
Estimated: 8,900 premature deaths per year
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Smoothed Exposure-Response FunctionCardiopulmonary Mortality
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Health Effects of Ozone Exposure
Respiratory symptoms Airway inflammation Increased hospital and ER usage Premature death
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Effects of Ozone Exposure in Children
Reduced lung function with acute exposure
Lower attained lung function in young adults raised in high ozone areas
Increased school absenteeism Asthma induction in active children living
in high ozone communities Emergency room visits for asthma
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Populations Most at Risk: O3
Responses proportional to inhaled dose Inhaled dose is a function of
O3 concentration - most important factor Breathing rate Exposure duration
Most at risk Children Workers Active and exercising people
Estimated: 630 premature deaths per year
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A toxic air contaminant and a component of PM2.5
Diesel PM
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Why are Diesel PM Emissions Important?
Health effects are significant Emissions are high
One million diesel engines (typical day)
Risk is high 70-80% of all air cancer risk
Adds to the exposure to PM2.5
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Health Effects of Diesel PM Emissions
Diesel engine exhaust classified as carcinogenic Decision by IARC; part of World Health Organization
Non cancer health effects Short-term exposure – respiratory symptoms;
irritation of the eye, nose, throat Health effects (as a component of PM2.5)
Long-term exposure – chronic respiratory symptoms, worsening of asthma, reduced lung function, lung cancer
Hospitalizations, lost work days Premature mortality
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California Diesel PM Concentrations
Estimated: 1,200 premature deaths per year Estimated: 214 additional cancer cases per million
population per year
Los Angeles
Bay AreaDPM µg/m3
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Near Roadway Exposures
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Near Roadway Exposures Near roadway pollutants:
Black carbon (diesel PM) NOx Ultrafine PM
Large fraction of population live near roadways Health effects:
Increased asthma and other respiratory disease
Reduced lung function Increased heart disease Adverse birth outcomes Premature death
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Near Roadway Exposures
Factors affecting exposure: Meteorology (wind speed); traffic density &
composition Physical barriers (sound walls) In-vehicle and in-home filtration
0
30
60
90
120
150
180
-1500 -1000 -500 0 500 1000 1500 2000 2500
Distance from Freeway (m)
NO
Con
cent
ratio
n (p
pb)
0
15
30
45
60
PA
H C
once
ntra
tion
(ng/
m^3
)NOPAH
DownwindUpwind
Freeway
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Conclusions Outdoor air pollution is a
significant public health risk PM2.5 a leading risk factor for
premature death on a global scale Risk: PM2.5 > Ozone > Toxics
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For More Information Health Effects of Air Pollution Exposures:http://www.arb.ca.gov/research/health/health.htm Ambient Air Quality Standards & Health Effects
Estimates:http://www.arb.ca.gov/research/aaqs/aaqs.htm Contact information:
Linda SmithResearch DivisionCalifornia Air Resources [email protected]
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