Millions Told To Avoid Driving On 4th of July
Newsweek AI is in beta. Translations may contain inaccuracies—please refer to the original content.
Air quality alerts were issued by the National Weather Service (NWS) in conjunction with local authorities for multiple states as of July 4, with officials advising residents in effected areas to take steps to help reduce air pollution in their area.
Why It Matters
Experts caution that unhealthy air quality heightens health risks for vulnerable populations, such as older adults, young children, and those with respiratory illnesses.
What To Know
In Michigan, affected areas included the southwestern and southeastern portions of the state.
Weather conditions would be favorable for elevated ozone levels, according to the Michigan Department of Environment, Great Lakes, and Energy. In the Detroit metropolitan area, "stagnant conditions" would also allow smoke from fireworks displays to accumulate, the agency said.
4th of July preparations are seen on the National Mall during the procedural vote on the One Big Beautiful Bill Act on July 03, 2025 in Washington, D.C.
4th of July preparations are seen on the National Mall during the procedural vote on the One Big Beautiful Bill Act on July 03, 2025 in Washington, D.C.Central Indiana and surrounding areas were also issued alerts, due to both ozone and fine particles.
In Illinois, an air pollution action day was in effect until midnight on Friday. The alert explained that these are declared "when weather conditions are such that widespread ozone and or particulate levels are expected to be at or above the Unhealthy for Sensitive Groups category of the Air Quality Index for multiple days."
While ozone was expected to be the primary pollutant, emissions from fireworks could also contribute to poorer air quality, according to the Illinois Environmental Protection Agency.
In Ohio, ozone forecasts prompted an advisory to be issued for Butler, Clermont, Hamilton and Warren Counties.
Meanwhile, an ozone high pollution advisory was issued for Maricopa County and the Phoenix metropolitan area in Arizona for Monday, where officials said forecast weather conditions could result in potentially unhealthy pollution levels.
Additional air quality alerts were in place for parts of California, Virginia, and the District of Columbia.
Local authorities urged people in affected areas to take steps to reduce air pollution, including driving less, walking or bike riding, avoiding additional sources of pollution such as gasoline-powered lawn equipment, and using public transport.
What People Are Saying
AccuWeather meteorologist Brandon Buckingham previously told Newsweek: "Ozone is a secondary pollutant, meaning it's not emitted directly from sources, but is formed through chemical reactions. These reactions require sunlight and higher temperatures, making warmer months more prone to ozone formation. When air is stagnant, pollutants don't get dispersed, allowing ozone to build up to unhealthy levels.
"Ozone pollution is often more severe in urban areas where there are higher concentrations of pollutants from sources like cars, power plants, and industrial activities."
Jonathan Grigg, professor of pediatric respiratory and environmental medicine at Queen Mary, University of London, previously told Newsweek that there are "very clear links" between inhaling particles and earlier death from both respiratory and cardiovascular diseases.
He added: "There are vulnerable groups and classically they are children because they've got an extra issue to do with their lungs developing, whereas our lungs are not developing as adults."
What Happens Next
At the time of writing, the latest of the air quality alerts were in effect through Monday, though most were set to expire before this.
The NWS issues regular forecast updates on its website.
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