The wildfire smoke hovering over parts of eastern Canada and the U.S. this week has led many to start poring over charts and figures to get a sense of the air quality in their area.But what exactly do these indexes measure, and how should they be interpreted?Different countries have different ways of measuring air quality, including Canada, said Dan Westervelt, an associate research professor at Columbia Climate School's Lamont-Doherty Earth Observatory.
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