Trump's 250th birthday fireworks could drive hazardous air over Washington

Donald Trump’s 850,000-pyrotechnic July 4 spectacle over Washington was planned to send particulate pollution around the National Mall into hazardous territory, with National Park Service modeling projecting PM2.5 levels of 600 to 1,200 micrograms per cubic meter and a worst case above 2,000. The display sat at the center of Freedom 250, the Park Service’s official public-private partnership for the nation’s 250th-anniversary celebrations, and the White House called it the centerpiece of the milestone and the largest pyrotechnics display in history.

The show was set to run about 35 to 40 minutes and to launch from 10 sites across the capital, including the Lincoln Memorial Reflecting Pool, eight Potomac River barges and West Potomac Park. That scale dwarfed the previous National Mall Fourth of July display, which used about 7,000 fireworks, turning this year’s plan into a roughly hundredfold increase in fireworks output over the usual show.

Particulate matter is one of the most dangerous forms of air pollution, and the Environmental Protection Agency links it to serious and sometimes deadly health effects, especially for children, older adults and people with heart or lung disease. In the case of the Mall fireworks, the modeling pointed to central Washington experiencing very unhealthy air for hours after the finale, leaving the people closest to the launch points with the heaviest exposure. That included spectators along the Mall and riverfront, as well as anyone already breathing compromised air because of asthma, heart disease or other chronic conditions.

Road and area closures on the National Mall began July 3 to make room for setup and cleanup, and the public event page directed visitors to special viewing areas and medical aid stations for the holiday weekend.