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reviewed the 10 leading metro areas with the highest levels of year-round particle pollution.

According to Nolen, the biggest source of pollution in the area is the U. In addition to the wildfires and drought that have affected the region, the area's natural topography exacerbates the pollution problem.The report considers two types of pollution: ozone pollution and particle pollution, which can be measured both in short and long-term. Janice Nolen, assistant vice president of national policy at the ALA, explained the three measures.Ozone is a gas formed in the atmosphere through heat, sunlight, and certain gases that can attack lung tissue.See More: The World's Top 20 Honeymoon Destinations Take a look at the infographics below to see if your wedding location made the list! While exposure to low quality air has declined in recent years, some cities still experience alarming levels of pollution.