ニューヨーク・タイムズのインスタグラム(nytimes) - 6月9日 03時16分

Just how bad was the pollution in New York on Wednesday? Historically bad, even compared with places around the world that generally experience much more air pollution.

The chart above shows the concentration of a particularly dangerous kind of air pollution, as measured by the state’s Department of Environmental Conservation from a network of sensors around the city.

Those sensors measured levels of particles 2.5 microns in diameter or smaller, brought by wind from wildfires in Canada. Wednesday’s daily average was the highest since recording in New York began in 1999. (The second-highest level was on Tuesday.) Wednesday’s level of pollution was also higher than the worst daily average record in San Francisco — on Nov. 16, 2018, when wildfires were blazing in Northern California — and it approached average pollution levels recorded in Portland, Oregon, on Sept. 13, 2020, during the worst of its pollution from nearby wildfires.

The small particles measured by the sensors — each about a 30th as wide as a human hair — are dangerous to human health because they are tiny enough to penetrate into the lungs and bloodstream. The Environmental Protection Agency closely tracks pollution of this type from smokestacks and vehicles. Learn more at the link in our bio.

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