Smoke from wildfires in Northern California blanket the city of San Francisco. Is it safe for the workers outside breathing the air all day?
from Science Latest https://www.wired.com/story/construction-workers-toil-away-in-san-franciscos-toxic-air
from Science Latest https://www.wired.com/story/construction-workers-toil-away-in-san-franciscos-toxic-air
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