Google Earth Has Cars Sniffing U.S. Cities to Guard Your Health

A Google street view car in Berlin on Nov. 7, 2016.

Photographer: Tobias Schwarz/AFP/Getty Images

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As firefighters fought to control deadly wildfires north of San Francisco last month, a small unit of Alphabet Inc.’s Google had a more modest goal. It had employees driving cars around loaded with air-monitoring equipment to measure how badly the smoke was polluting the air.

The conclusion: a lot.