22 agosto 2014
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.
http://feeds.sciencedaily.com/~r/sciencedaily/~3/80bz8VSSMlo/140822084248.htm
