Air pollution

FILE- In this March 5, 2013, file photo, Trinidad Drilling rigs are seen off of Way Highway 59 outside of Douglas, Wyo. A judge has blocked oil and gas drilling on almost 500 square miles in Wyoming and says the government must consider cumulative climate change impacts of leasing public lands across the U.S. for energy development. The order marks the latest in a string of court rulings over the past decade faulting the government's consideration of emissions when issuing energy leases. (Leah Millis/The Casper Star-Tribune via AP, File)

Students play with an inflatable globe as they march to demand action on climate change, in Rome, Friday, March 15, 2019. Students worldwide are skipping class Friday to take to the streets to protest their governments' failure to take sufficient action against global warming. (Alessandro Di Meo/ANSA via AP)

Former U.S. Vice President Al Gore, founder of the Climate Reality Project, speaks with youth climate activists durung a panel discussion on global climate, Friday, March 15, 2019, in Atlanta. (AP Photo/Mike Stewart)

Youngsters stand on the Queen Victoria Memorial outside Buckingham Palace as they take part in a student climate protest in London, Friday, March 15, 2019. Students in more than 80 countries and territories worldwide plan to skip class Friday in protest over their governments' failure to act against global warming. The coordinated 'school strike' was inspired by 16-year-old activist Greta Thunberg, who began holding solitary demonstrations outside the Swedish parliament last year. (AP Photo/Matt Dunham)

FILE - In this Jan. 19, 2017 file photo Martin Winterkorn, former CEO of the German car manufacturer 'Volkswagen', arrives for a questioning at an investigation committee of the German federal parliament in Berlin, Germany. The Securities and Exchange Commission is charging Volkswagen and former CEO Martin Winterkorn with defrauding American investors during an emissions scandal. The SEC said that between April 2014 and May 2015 Volkswagen issued more than $13 billion in bonds and asset-backed securities in U.S. markets when senior executives knew that more than 500,000 vehicles in the country grossly exceeded legal vehicle emissions limits. (AP Photo/Michael Sohn, file)

FILE- In this Oc. 21, 2018, file photo the company logo shines off the front of a vehicle at a Fiat dealership in Highlands Ranch, Colo. Fiat Chrysler is voluntarily recalling vehicles in the U.S. because they don't meet the country's emission standards. The Environmental Protection Agency says that the recall is the result of in-use emissions investigations it performed and in-use testing conducted by Fiat Chrysler as required by EPA regulations. (AP Photo/David Zalubowski, File)

FILE - In this Friday, Sept. 14, 2018 file photo, Russ Lewis covers his eyes from a gust of wind and a blast of sand as Hurricane Florence approaches Myrtle Beach, S.C. According to a scientific report from the United Nations released on Wednesday, March 13, 2019, climate change, a global major extinction of animals and plants, a human population soaring toward 10 billion, degraded land, polluted air, and plastics, pesticides and hormone-changing chemicals in the water are making the planet an increasing unhealthy place for people. (AP Photo/David Goldman)

Herbert Diess, CEO of the Volkswagen AG, addresses the media during the annual press conference of the car manufacturer Volkswagen AG in Wolfsburg, Germany, Tuesday, March 12, 2019. (Christophe Gateau/dpa via AP)

FILE - In this Dec. 17, 2010 file photo, trucks make their way in Livermore, Calif. A new study released Monday, March 11, 2019, says African-Americans and Hispanics breathe in far more deadly air pollution than they are responsible for making. (AP Photo/Ben Margot, File)