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Fine Particulate Matter (also known as PM2.5) are particles in the air that measure less than 2.5 micrometers (μm) in diameter, and typically consists of a mix of things like smoke, soot, liquid or solid particles in aerosol, or biological matter like mould, bacteria, pollen and animal dander....

When outdoor air quality is poor, Health Canada recommends that individuals, particularly children, the elderly and those with pre-existing health conditions remain indoors as much as possible. Ensuring good indoor air quality is especially important during periods of poor outdoor air quality.

The Criminal Code is a federal law that includes definitions of most of the criminal offences that the Parliament of Canada has enacted. It is often updated as society evolves and to improve the Canadian criminal process.