Poor air quality lingering in L.A. after July 4 firework shows

Air quality dropped significantly after hundreds of July 4 fireworks lit up the sky across the Los Angeles area on Monday, and remained at poor levels through Tuesday morning in many areas.

The South Coast Air Quality Management District has issued a county advisory through Tuesday for much of Southern California, from Los Angeles and into the Coachella Valley, because fireworks emit high levels of particulate matter. and metals cause air pollution.

“Fine particle levels on July 4 and July 5 are typically among the worst days of the year in the South Coast Air Basin,” the advisor said. “Smoke and combustion products from fireworks add to the fine particles already in the basin mainly caused by motor vehicles, as well as dust and industrial emissions.”

Pollution from fireworks last July 4 caused the second worst air quality measures on record since the holiday season.

Areas outside of Los Angeles – from Thousand Oaks to El Monte and Riverside – remained at poor air quality levels Tuesday morning, according to the South Coast Air Quality Management District. Parts of downtown LA are still considered unhealthy for sensitive groups, but most of South LA recovered from the fireworks pollution as of 10 a.m. Tuesday.

For most of Monday, measurements on the US Air Quality Index hovered around average or good in the Downtown Los Angeles area, but only until 9 p.m. “and by 10 p.m., the measurement had dropped two readings to ‘very unhealthy,'” the data showed.

That level remained for the next three hours, improving only to the “unhealthy” level for most of Tuesday morning – a grade that was still three levels below Monday’s pre-evening fireworks, according to the Air Quality Index.

According to the index over the same time frame, northern Orange County saw a similar change, going from “good” or “average” air quality before 10 p.m., to “unhealthy” or “very unhealthy.” But by 4 a.m. Tuesday, that area’s air quality had recovered back to “moderate,” the data showed.

The area west of the San Gabriel Valley followed a similar trend with evening fireworks, shifting from relatively good air quality measurements Monday night to “unhealthy” or “very unhealthy.” healthy” late Monday and into Tuesday.

But some areas not far from the coast, such as Culver City, did not see any drastic changes in air quality, remaining at good levels through Monday night and into Tuesday. Other areas to the south, including Long Beach and Hermosa Beach, recovered much more quickly from fireworks shows, although those areas still recorded “unhealthy” air levels. “right after 9 p.m. By Tuesday morning, most of the coast and southern LA were back to fresh or moderate air quality levels.

The South Coast Air Quality Management District warns residents that breathing in fine particulate matter can lead to “heart and respiratory health effects,” such as coughing, shortness of breath, decreased lung function or even heart attack.

The region’s aviation notice expires on Wednesday.

https://www.latimes.com/california/story/2022-07-05/poor-air-quality-lingering-in-los-angeles-after-fourth-of-firework-shows Poor air quality lingering in L.A. after July 4 firework shows

Edmund DeMarche

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