Lung Association Ranks San Diego 7th Dirtiest City For Ozone Pollution

The greater Los‚ÄČAngeles area has the worst ozone problem in the nation but the number of unhealthful days is on a declining trend with 2015 the best year so far

Kevin Stewart, director of Environmental Health at the American Lung Association of the Mid-Atlantic, said it's hard to say why Northampton fared so poorly in that regard while Warren County, just across the Delaware River, rated an "A" in the same category.

The report finds 125 million people live in areas of the country with unhealthy levels of air pollution.

To identify the 25 most polluted US cities, 24/7 Wall St. reviewed the metropolitan statistical areas with the highest levels of ozone pollution, measured in days in a year when the concentration of ozone, or smog, exceeded the EPA standard from the ALA's 2017 "State of the Air 2017" report.

The group cited the Clean Air Act for cleaning up air pollution.

All cities in OH continue to show progress in reducing air pollution, especially in year-round particle pollution and ozone.

In the Bay Area, San Francisco, Marin and Sonoma counties got A grades for ozone, while Napa and San Mateo counties received B grades. It's first (or last) in short-term particle pollution, and second in both year-round particle pollution and ozone pollution.

The American Lung Association report revealed approximately 125 million Americans across the country or 40 percent of the nationwide population, are now living amid unhealthy air pollution levels, National Geographic reports.

All major cities in the state had fewer unhealthy ozone days, and every city hit its lowest level for ozone. However, it still is higher than the 21.2 days on average recorded in 2009-2011.

These are America's most polluted cities.

Soot increases the risks of early death and serious health problems such as asthma and cardiovascular disease, according to the Lung Association.

"Imperial County has five monitors which measure the pollution, whether its ozone and also PM 2.5, PM 10", Lugo said.

Experts attributed the improved air quality to cleaner forms of electrical generation and the retirement of aged diesel engines.

A new report released by the American Lung Association found that a majority of California counties received a failing grade for air quality, with many in Northern California sitting near the bottom of the list.

The Modesto and Merced areas are ranked as the sixth most polluted metropolitan areas in the nation when it comes to particle and ozone pollution, the report said. These particles are so small that they can lodge deep in the lungs and trigger asthma attacks, heart attacks and strokes. The high number of sunny days in Southern California also boost ozone levels, the report said, adding that the state would be in worse shape were it not for strict auto emission regulations as well as limiting coal-fired power plants.

The study looked at ozone - or smog - levels as well as particle pollution from a range of sources, including soot, smoke, pollen and molds, Boucher said.

The results for short-term particle pollution shows overall improvement, but more mixed results.

Luzerne County residents are breathing clean air.

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