Air is a common term for the atmosphere: the layer of nitrogen, oxygen and other trace gases that surround our planet and make life on Earth possible.

The atmosphere is a complex natural system. Air pollution from transportation, industries, and other sources causes an imbalance in this system by modifying its chemical composition. Living things are affected by air pollution in a variety of negative ways.

This section contains information on Environment and Climate Change Canada's efforts to reduce air pollution and better understand its levels, causes and sources.

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