The city is now the seventh most polluted place on Earth, according to one tracker, with nine times the international air quality guideline level.
San Francisco currently ranks among the worst places for air quality as smoke from wildfires in northern California and Oregon descends on the Bay Area.
The city has the seventh most polluted air among regions of the world, behind Lahore in Pakistan and Jakarta in Indonesia, according to IQAir, a monitoring company. While pollution is likely to play a role in San Francisco's poor air quality, tracking data shows it has gone from being deemed"good" on Monday to nine times the annual pollutant guideline set by the World Health Organization as of Tuesday.
Overall, the West Coast city of more than 815,000 people has an air quality index rating of 123, the government's AirNow monitoring platform says, meaning it is likely unhealthy for sensitive individuals. IQAir puts its AQI at 107—above Kampala in Uganda and Johannesburg, South Africa. The National Weather Service station in San Francisco attributed the smoky conditions to the Anvil Fire in southwest Oregon—which currently ranges across 9,023 acres—as well as smaller wildfires in northwestern California, the smoke from which was being carried on northerly winds.
A map showing air quality levels across central California as of 12 a.m. PT on September 20, 2023. Areas shaded green denote where air quality is deemed at healthy levels; yellow where it is moderately poor; orange where it may affect sensitive individuals; and red where air pollution is considered unhealthy.The warnings come after vast swathes of the north and eastern U.S. were smothered in smoky fog that descended from massive wildfires in Canada earlier in the summer.
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