Clean Air Online provides timely, locally relevant and action-oriented information, tools and resources focused on clean air and air quality issues.
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 Canada's efforts to reduce air pollution and better understand its levels, causes and sources.