Blessed by winds off the Pacific Ocean, Napa County got good grades from the American Lung Association for its average air quality during the years 2013, 2014 and 2015.
Bakersfield, Calif., maintained its title of worst city in the United States for short-term particle pollution, and five other California cities were among the 10 considered most affected by short-term pollution.
Janice Nolen, the lead author of the ALA report, told Business Insider that local problems like vehicle traffic can make cities' ozone or particle problems worse, but that the overall issue is a national one.
Most of Michigan's 17 counties with data earned an "A" for low levels of particle pollution, including Allegan and Kent counties.
The six metropolitan areas on the complete most polluted cities list which also had at least some days where air pollution did not reach unhealthy levels includes, Elmira, New York, Wilmington, North Carolina, Burlington, Vermont, Melbourne, Florida, and the Fort Myers and Naples region of Florida.
Officials from multiple agencies unveiled on Wednesday, April 19th a new tool to alert residents when air pollution is at an unsafe level. Ground-level ozone, a main ingredient of smog, has harmful effects, especially on children, older adults, people with respiratory illnesses, and those who work outdoors.
Brown, Kewaunee, Shawano, Oconto and Menominee counties received their best ever rankings for both ozone and particle pollution.
The largest improvements in air quality result from continuing reductions in high ozone days and levels of year-round particle pollution, the report found.
It also can cause heart and lung health problems and is a leading greenhouse gas contributor to climate warming.
The southeast region of the country has some of the healthiest air in the country, according to a new report. "It's all trapping and not dispersing air pollution that normally would when we have weather conditions".
The report shows Brown County received a grade "B" for particle pollution.
The ALA has been issuing annual air-quality reports for the past 18 years that analyze geographically the number of days with high levels of ground-level ozone, commonly known as smog, and particle pollution, or soot.
"The air is cleaner, but not clean enough to protect people from increased risks of premature death, asthma attacks and lung cancer that research shows comes from breathing these pollutants", Bryan said in a statement.
Winds can carry ozone pollution far distances, which means Connecticut's ozone isn't necessarily generated within its borders. The nearly year around warm weather may make the state a prime vacation spot, but also reportedly increases the already high levels of ozone pollution. "Even with the drought and wildfires of recent years, we still enjoy the Lake County clean air".
By comparison, three counties in Georgia and one county in North Carolina received a grade of "F" for having a high number of unhealthy ozone days during that time.
"We were lucky to have a wet year this year", said Bonnie Holmes-Gen, senior director for air quality and climate change with the American Lung Association in California.