Image: Fireworks burst in Washington DC to celebrate America’s 250th anniversary. Photograph: J David Ake/Getty Images

Dharna Noor of The Guardian reports: “Washington DC residents breathed in “unhealthy” air for hours after a 40-minute Independence Day fireworks show over the National Mall on Saturday night, with the country’s capital briefly recording the worst air quality of any major city in the world.

The highly emitting display, which the president called “spectacular”, came as the Trump administration rolls back an unprecedented number of pollution controls.

Hourly concentrations of particulate matter rose to 6.7 times their pre-fireworks levels, according to a Tuesday analysis from the company Clarity Movement based on its network of 26 air quality sensors throughout the city in partnership with the local department of energy and environment. Every one of those sensors reached air quality levels which the Environmental Protection Agency deems “unhealthy for sensitive groups” during the event, the researchers found, with some recording even worse levels of emissions…”

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