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Originally posted by arnold_vosloo
Every country is polluting another by something called wind, it generally moves things from one place to another
Blowin' in the wind
Canada's smoggiest places
GET OUT YOUR GAS MASKS: May is the beginning of smog season, which lasts until September. Smog is caused largely by the burning of fossil fuels in power plants, factories, homes and vehicles. It is made up of fine airborne particles, which combine with sulphur dioxide and other chemicals, and ground-level ozone, a colourless gas that forms when nitrogen oxides and volatile organic compounds react in sunlight. As our map shows, much of the pollution that causes smog drifts north from sources in the United States.