The Fourth of July fireworks display in the capital impacted the amount of fine particulate matter in the atmosphere.

Internal National Park Service documents seen by The Washington Post suggest visitors should “avoid prolonged exposure” in unhealthy areas

A draft air-quality analysis conducted using NPS modeling warns that individuals should “avoid prolonged exposure” to the pollution following the display.

With bigger fireworks celebrations across the US, cities are expected to experience poor air quality under historic heat.

A severe heatwave has disrupted Fourth of July celebrations across the central and eastern United States, forcing cancellations of parades, concerts, and fireworks.…

A dangerous heat wave disrupts July 4th celebrations across the U.S., affecting events, World Cup matches, and power grids.

National Weather Service issued an extreme heat warning as high temperatures have paralyzed the east coast

The oppressive heat also altered celebrations in Philadelphia, where temperatures were expected to reach 99 degrees.

The Fourth of July fireworks display in the capital impacted the amount of fine particulate matter in the atmosphere.

A "purple" air quality alert was issued for Washington, D.C., and surrounding areas, meaning pollution reached levels considered "very unhealthy."

Residents of Washington, DC, on Sunday briefly experienced the worst air quality of any major city in the world, according to a company that ranks pollution globally, as the…

Yesterday, Donald Trump’s July 4th finale — which was so poorly planned it didn’t take place until July 5th — looked less like a fireworks show and more like the end of the world.…

Les stations de surveillance de la capitale américaine ont noté une hausse des concentrations de polluants sous l'effet des feux d'artifice du 4 juillet. Selon la plateforme…

Les stations de surveillance de la capitale américaine ont noté une hausse des concentrations de polluants sous l'effet des feux d'artifice du 4 juillet. Selon la plateforme…

The US capital Washington saw its worst air quality of the year over the July 4th weekend, as smoke from a massive fireworks display sent pollution soaring to levels considered…

Le feu d'artifice géant tiré pour le 250e anniversaire des États-Unis, Washington a enregistré sa pire qualité de l'air de l'année.

Air quality across Washington, northern Virginia, and the surrounding suburbs had returned to the “moderate” range by Monday morning.