Scientists collect and analyze samples of air in different regions of Canada on a regular basis to determine pollutant levels. This information is not only used by decision-makers to pinpoint the sources of air pollution and determine strategies for reducing it, but also to produce daily air-quality forecasts that warn Canadians when smog levels are high.
The condition of air, as it relates to pollution in a particular area as measured by the Air Quality Index.
is determined by measuring the number and concentration of potentially harmful substances in the air