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An analysis of air quality and childhood asthma in Los Angeles found that kids' health improved when smog declined. Frederic J. Brown/AFP/Getty Images hide caption

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Frederic J. Brown/AFP/Getty Images

When LA's Air Got Better, Kids' Asthma Cases Dropped

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An aerial view of a combine harvesting corn in a field near Jarrettsville, Md. A new study ties an estimated 4,300 premature deaths a year to the air pollution caused by corn production in the U.S. Edwin Remsberg/Getty Images hide caption

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Edwin Remsberg/Getty Images

Oily fish such as salmon, sardines and lake trout, as well as some plant sources such as walnuts and flaxseed, can be good, tasty sources of omega-3 fatty acids. MinoruM/Getty Images hide caption

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MinoruM/Getty Images

Eating Fish May Help City Kids With Asthma Breathe Better

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Smog fills Utah's Salt Lake Valley in January 2017. Winter weather in the area often traps air pollution that is bad for public health. George Frey/Getty Images hide caption

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George Frey/Getty Images

EPA Science Panel Considering Guidelines That Upend Basic Air Pollution Science

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Thailand's Pollution Control Department declared air quality in the the Thai capital unhealthy, leading to the closure of 400 public schools through the end of the week. Romeo Gacad/AFP/Getty Images hide caption

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Romeo Gacad/AFP/Getty Images

University of Oregon scientists used real dust from inside homes around Portland to test the effects of sunlight, UV light and darkness on bacteria found in the dust. Dave G Kelly/Getty Images hide caption

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Dave G Kelly/Getty Images

A thick layer of smoke from the Carr Fire settles over California's Central Valley in a view from a jet earlier this summer. Fine particulate matter from drifting wildfire smoke mixes with industrial ozone and can become trapped between the mountain ranges. George Rose/Getty Images hide caption

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George Rose/Getty Images

A road sign on Hamburg's Max-Brauer-Allee warns motorists that older diesel vehicles are banned from using this stretch of road. Hamburg is the first German city to ban older diesel vehicles. Daniel Bockwoldt/AFP/Getty Images hide caption

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Daniel Bockwoldt/AFP/Getty Images

Could A Diesel Ban In Hamburg, Germany, Cause More Pollution? Some Residents Worry

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When wildfire smoke choked their community last summer, Amy Cilimburg (left), the director of Climate Smart Missoula, helped Joy and Don Dunagan, of Seeley Lake, Mont., get a HEPA air filter through a partnership with the Missoula City-County Health Department. Nora Saks / Montana Public Radio hide caption

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Nora Saks / Montana Public Radio

When Wildfire Smoke Invades, Who Should Pay To Clean Indoor Air?

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Mayor Anne Hidalgo has called for an end to gas-powered vehicles in Paris by 2030, in favor of biking, transit, and electric cars. Here, cyclists and pedestrians on the Champs- Élysées during the city's "day without cars" on Oct. 1. Christophe Simon/AFP/Getty Images hide caption

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Christophe Simon/AFP/Getty Images

The sky over Santa Rosa, Calif., on Monday. Lesley McClurg/KQED hide caption

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Lesley McClurg/KQED

This Week's Air Quality Is Worst On Record For San Francisco Bay Area

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South Korea has the worst air pollution among the developed nations in the the Organization for Economic Cooperation and Development (OECD). Ed Jones/AFP/Getty Images hide caption

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Ed Jones/AFP/Getty Images

Armed With NASA Data, South Korea Confronts Its Choking Smog

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A smokestack rises in the background over the East Houston community of Manchester, Texas, where the air was heavy with what smelled like gasoline after Hurricane Harvey in late August. The neighborhood is ringed by industrial sites. Claire Harbage/NPR hide caption

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Claire Harbage/NPR

Air Pollution From Industry Plagues Houston In Harvey's Wake

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