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Ambient Levels and Trends
AMBIENT LEVELS AND TRENDS
Canadian Ambient Data Source
The Canadian ambient data was collected through the National Air Pollution Surveillance (NAPS) Network, a joint federal, provincial, territorial and municipal program. Data from both NAPS-designated sites and other sites operated or supervised by provincial, territorial and municipal jurisdictions are also included. Data from ozone monitors operated by the Canadian air and Precipitation Monitoring Network (CAPMoN) are also used. CAPMoN is operated by Environment Canada.
Figure 1 shows the PM2.5 levels in the form of the CWS for Canadian communities and reporting sub-areas (RSAs) for the period 2003-2005. Figure 2 shows the CMA, CA, CSD and RSA boundaries for these communities and areas along with their associated levels in the form of the Standard. The levels in these figures are as reported by provincial and territorial jurisdictions in accordance with the procedures detailed in the GDAD.
For the period 2003 to 2005, at least 30% of the Canadian population (approximately 10 million) lived in communities with levels above the CWS. Most of these were located in Ontario and Quebec. Outside these two provinces, only two communities within 10% of the Standard were also primarily located in Ontario and Quebec.
In the western part of Canada, PM2.5 levels varied (Figure 1) from 17 to 23 µg/m3 in Yukon and the Northwest Territories, 10 to 34 µg/m3 in British Columbia, 11 to 22 µg/m3 in Alberta, and 9 to 15 µg/m3 in Saskatchewan and Manitoba. In the eastern part of Canada, levels varied from 28 to 34 µg/m3 in Ontario, 23 to 40 µg/m3 Quebec, and 10 to 16 µg/m3 in Atlantic Canada.
Figure 1: PM 2.5 levels in the form of the CWS, 2003-2005
Notes: Shown are the values of the 3-year average of the annual 98th percentiles of the daily 24-hour PM2.5 based on the procedures in GDAD. Yellow band represents levels within 10% of the CWS. Values for Kitchener and Guelph are based on two years of data. The PM2.5 levels shown are from continuous monitors, consisting of the TEOM® (the majority) and BAM monitors. In blue with * are communities with populations of 100,000 or less that jurisdictions elected to report on. In green italic are non-urban monitoring stations. Data provided by provincial and territorial jurisdictions, and generated from measurements collected through NAPS. Data are preliminary and subject to change following further data quality assurance reviews.
Figure 2: Map of Canada showing PM2.5 levels in the form of the CWS, 2003-2005
Notes: Shown are the values of the 3-year average of the annual 98th percentile of the daily 24-hour average PM2.5 based on the procedures in the GDAD. Values for Kitchener and Guelph are based on two years of data. Blue-hatched areas have insufficient data. Data provided by provincial and territorial jurisdictions, and generated from measurements collected through NAPS. Data are preliminary and subject to change following further data quality assurance reviews.
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