Without comprehensive coverage, communities can be exposed to significant pollution events that go undetected."
Lu indicated that subsequent thunderstorms on Sunday evening prevented an even worse environmental outcome.
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"Despite the scale of the fireworks display, the city's air quality avoided a worst-case scenario thanks to favorable weather conditions and the timing of the event," he said.
The massive holiday display was organized by the non-profit Freedom 250 and commenced at 11 p. m.
Saturday.
Organizers confirmed the event involved launching more than 850,000 fireworks from 10 distinct sites, compared to a typical DC show featuring around 17,000 shells.
The celebration occurred while the region experienced a severe heatwave with triple-digit temperatures earlier that day.
AirNow, the EPA website tracking ambient air conditions, confirmed the global capital pollution ranking during the aftermath.
White House spokesperson Taylor Rogers defended the scale of the event.
"It was the largest and greatest firework display in the history of our country to properly celebrate America's 250th birthday!
Every year, fireworks on the Fourth of July cause short-term spikes in air quality across the United States, including Washington, DC.
This was not unique to the 250th fireworks celebrations in our nation's capital."
According to the American Lung Association, Americans discharge nearly 300 million pounds of fireworks into the atmosphere annually.
These displays release harmful pollutants including sulfur dioxide, carbon dioxide, and carbon monoxide.
The administrative context includes ongoing regulatory rollbacks on domestic pollution controls, such as pausing fine particulate matter evaluations and boosting coal energy.
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On July 4, nine individuals convicted of Clean Air Act violations received presidential pardons.
