Health Effects of PM10 Particulates
 
Total Suspended Particulate (TSP) refers to all of the liquid and solid airborne particles found in the ambient atmosphere. Particles less than 10 micrometers (microns) in diameter are called PM10. These are small enough to be inhaled into the lungs posing a significant health risk.
 
 
Acid aerosols are among the smallest particles comprising PM10. They are generated in the atmosphere when sulphur dioxide (SO2) and nitrogen oxides (NOx) are transformed into sulphuric and nitric acid compounds.
 
Particulate matter is emitted from point sources: fuel combustion in engines and power plants, waste incineration; and area sources: construction, mining, residential wood burning and road and soil dust.
 
Health Effects
 
Particles Affect Sensitive Groups
 
Many studies have shown that particles affect us all. However, certain groups seem more sensitive to particulate pollution. Studies show that children with respiratory symptoms, as well as the elderly, are more susceptible to the effects of PM10. Neas* and others in 1995 found that only children with a history of respiratory symptoms were sensitive to the low levels of pollution recorded during their study. PM10 pollution causes greater increases in mortality among the elderly than in other age groups, as shown by Schwartz and Dockery* in a 1992 study. Certain groups of people have lower thresholds for responding to particulate pollution. These groups should take extra precautions to limit their exposure during high pollution days.
 
Particles reduce lung function and increase mortality
 
Particles smaller than ten microns (PM10) penetrate deep into our lungs. Here, chemicals ranging from metal compounds to acid droplets react to reduce lung function and produce other effects leading to increased mortality. Pope & Dockery* found in a 1992 study that children suffer temporary reductions in lung capacity during higher PM10 days. Schwartz* found in a 1993 study that increased PM10 was associated with an increased number of deaths. Other studies confirm these findings. The pollutants which make up PM10 represent a serious threat to our health.
 
Acidic Particles Affect Our Health
 
Acidic particles, or acid aerosols, represent a distinct health risk. Neas* and others, in 1995, found an effect of acid aerosols on lung function in children which was independent of other particles. Thurston * and others examined the role of acid aerosols in Toronto in their 1992 paper. They found that on high pollution days, acid aerosols were the pollutants most strongly associated with respiratory admissions to hospitals. Further, sulphate, a type of acid aerosol, showed an association with admissions, even when considered separately. Acid aerosols are an important component of air pollution with distinct health effects on the population.
 
Did you know?
  • London, winter of 1952: A catastrophic one week air pollution episode occurred sending particulate levels soaring and resulting in 3500 excess deaths.


  • Even though there has been a 54% decline in total particulate levels since 1974, in the last 10 years fine particle levels have not decreased in Ontario.


  • Diesel engines emit 30 to 100 times more PM10 than gasoline powered engines do.


Particles Affect Sensitive Groups, Particles can cause Premature Death
 
What is being done?
 
Currently, the Ontario Ambient Air Quality Criterion for Total Suspended Particulates (TSP) is 120 micrograms per cubic metre (ug/m3) over 24 hours, and not greater than 60 ug/m3 annually. There is no standard for PM10 or acid aerosols. However, the new "Smog Plan" for Ontario includes a reduction of PM10.
 
A joint Federal/Provincial Air Quality Committee is developing a PM10 criterion based on its health effects.
 
The state of California has implement a PM10 criterion of 50 ug/m3 over 24 hours.
 
How can you help?
 
REDUCE YOUR OWN EMISSIONS: Decrease the amount you drive, and keep your car well tuned; avoid burning wood in your fireplace at home on calm nights.
 
BE INFORMED: Request information from local government, the Ministry of the Environment , Environment Canada, plant managers and environmental groups.
 
BE INVOLVED: PM10 standards need to be established. Write letters to the Minister of Environment and to your local MPP. Register complaints about air quality.


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