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September 10, 2020 06:07 pm

Why San Francisco Had an Apocalyptic Orange Sky

An anonymous reader shares a report: San Francisco residents awoke on Wednesday to an orange sky, like something out of the apocalypse. People shared images on social media of a sky turned hazy orange by smoke coming in from major wildfires throughout the region. Aclima, which measures air on a "hyperlocal" level with pollution sensors on cars, had an explanation for the phenomenon. The orange sky over the Bay Area didn't appear to match the hourly recommendations about pollution levels on the Bay Area Air Quality Management District's website, which generally showed healthy or moderate air pollution levels, except in the morning over Oakland and San Francisco, where air levels were shown to be unhealthy. But the mismatch between the smoky haze and the stats from sensors made sense to Aclima chief scientist Melissa Lunden, who spoke with VentureBeat in an interview. She said an inversion layer suspends the polluted, smoky air at least a couple of thousand feet in the air and keeps it from descending to the ground level where we breathe. "It's like a layer cake where the air doesn't mix," Lunden said. "The smoke that is here today has been transported from a long way away, as far as Oregon." Drone footage of San Francisco from yesterday, set to Blade Runner track.

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