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As smoke blew from wildfires burning hundreds of miles away near the Oregon border, Bay Area skies turned hazy, rekindling an unhealthy trend.
Researchers at Stanford University say the problem is likely to worsen in much of the United States in the years ahead.
New Stanford study shows fires are increasingly to blame for bad air, particularly in California and the West
New Stanford study shows fires are increasingly to blame for bad air, particularly in California and the West
New Stanford study shows fires are increasingly to blame for bad air, particularly in California and the West