News Main Animals Archaeology Dinosaurs Earth History Human Animal Space Tech   David McNew/Getty Images |   Toxic Air Downtown air quality is choked with the smoke of wildfires in Los Angeles, Calif. In 2007, severe wildfires roared through the United States, scorching 13 million acres of land, of which 1.3 million was in California. In a study published this week, researchers found that the California fires tripled the number of times ozone in the region exceeded the EPA health standard. | Video: Discovery Earth   « back to article

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