On Friday, the city reduced the levels reported by the sensors by nearly 50 percent, citing a “calibration algorithm.” Our chart above has been updated to reflect those new levels. The city’s pollution sensors are calibrated differently from those used by the Environmental Protection Agency to record measurements in those other cities, according to Patrick Gallahue, a spokesman for the city’s Department of Health. 13, 2020, during the worst of its pollution from nearby wildfires. 16, 2018, when wildfires were blazing in Northern California - and, at its peak, it approached average pollution levels recorded in Portland, Ore., on Sept.
(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.
Wednesday’s daily average was the highest since recording in New York began in 1999, according to data compiled by the Environmental Protection Agency. Those sensors measured levels of particles 2.5 microns in diameter or smaller, brought by wind from wildfires in Canada. The chart above shows the concentration of a particularly dangerous kind of air pollution according to provisional data measured by the New York City Community Air Survey and the state’s Department of Environmental Conservation from a network of sensors around the city. The air in New York City on Wednesday wasn’t just bad by the city’s standards.
Records reflect the Environmental Protection Agency’s highest daily average PM2.5 concentration for a given city from 1999 to 2023. Source: Provisional data from the New York City Community Air Survey and New York State Department of Environmental Conservation Curves show hourly concentrations of PM2.5 particles, measured in micrograms per cubic meter, for seven N.Y.C.
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