Once again, vast expanses of Canadian wilderness are on fire, threatening towns and forcing thousands to flee. It appears to be a breakout of “zombie fires”: wildfires from last year that never actually went out completely but carried on smoldering underground, reigniting ground vegetation again this year. They’ve been pouring smoke—once again—into northern cities in the United States. That haze is loaded with a more obscure form of carbon, compared to its famous cousin CO2: black carbon. By May 16, the fires’ monthly carbon emissions surpassed 15 megatons, soaring above previous years.
Black carbon consists of tiny particles generated from the incomplete combustion of
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