Despite significant reduction in smog-producing toxins, the Greater Toronto Area still violates Canada's standards for ozone air pollution

While the Greater Toronto Area has significantly reduced some of the toxins that contribute to smog, the city continues to violate the Canada-wide standards for ozone air pollution, a study shows. Smog, which can cause or aggravate health problems such as asthma, emphysema and chronic bronchitis, is produced by a set of complex photochemical reactions involving volatile organic compounds (VOCs), nitrogen oxides and sunlight, which form ground-level ozone.

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