As the United States celebrates its 250th birthday, record heat and monumental firework displays are expected to bring more pomp and circumstance than ever before. However, this combination may also lead to miserable air quality for July Fourth, affecting millions of Americans.

Air Quality Concerns

Firework celebrations, which are expected to be larger than normal this year, may multiply respiratory risks in areas already suffering from deteriorating air quality amid record-breaking temperatures. Experts warn that the smoke from fireworks can linger for several hours, sometimes rivaling the pollution from wildfires.

The heat dome forecasted to cover much of the country this week will limit winds and trap hot air close to the ground, potentially trapping smoke closer to the ground longer than usual. This may obscure the fireworks and worsen air quality.

Ground-Level Ozone

Scorching locations, such as Washington, D.C., are expected to experience at least moderate amounts of ground-level ozone during the day. This pollutant is typically formed when chemicals from car exhaust are baked under strong ultraviolet rays on hot days.

More than 50 million people will see triple-digit temperatures this week, with at least 100 record highs projected through Saturday, mostly on the East Coast. The nation’s capital is expected to hit around 102 degrees, reaching its hottest July Fourth on record.

Firework Displays

The grandest celebration will take place in Washington, D.C., where 850,000 fireworks are expected to launch in just 40 minutes from 10 sites. This will set a new Guinness World Record for the largest firework display. Other cities, such as New York, Nashville, and Boston, are also planning large firework displays.

However, the pyrotechnic spectaculars spell trouble in the air, immediately producing smoke and microscopic pollutants known as particulate matter (PM) 2.5. These pollutants can cause respiratory issues and worsen heart conditions.

Precautions

If the air quality index reaches ‘unhealthy’ levels, exceeding 100, the Environmental Protection Agency advises people who are pregnant, have pre-existing conditions like asthma, or are with young children or older adults to take caution. Wearing a proper N95 mask can limit exposure to pollutants.

Original reporting: KRDO (Colorado Springs metro) — read the source article.