smog

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An environmental issue is smog This kind of visible air pollution is composed of nitrogen oxides, sulfur oxides, ozone, smoke and other particulates. Man-made smog is derived from coal combustion emissions, vehicular emissions, industrial emissions, forest and agricultural fires and photo-chemical reactions of these emissions. Smog is often categorized as being summer smog or winter smog. Summer smog is primarily associated with the photo-chemical formation of ozone. During the summer season when the temperatures are warmer and there is more sunlight present, photo-chemical smog is the dominant type of smog formation. During the winter months when the temperatures are colder, and atmospheric inversions are common, there is an increase in coal and other fossil fuel usage to heat homes and buildings.