September 9, 2020 was a strange day, and Google Street View has the receipts. The 2020 wildfire season was a catastrophic, record-setting inferno in California. Over 9,000 fires ravaged 4,397,809 acres of the Golden State that year — around 4% of its 100 million acres. Mid-pandemic, the swirling smoke and deteriorating air quality gave Californians two reasons to wear a mask outside that summer. By September 9, the smoke from the Bear Fire in Butte County and the August Fire in the northern counties converged on the Bay Area. A marine layer of ocean fog held the smoke in place,...