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A couple standing on Alcatraz Island wears masks while looking out to the bay obscured by smoke and haze from wildfires Thursday, Nov. 15, 2018, in San Francisco. Recurring wildfires are sparking concern among medical experts about potentially major health consequences. Worsening asthma, lung disease and even heart attacks in heart disease patients have all been linked with previous fires. But blazes that used to be seasonal are happening nearly year-round and increasingly spreading into cities. That's exposing many more people to choking smoke that contains many of the same toxic ingredients as urban air pollution. (AP Photo/Eric Risberg)