It's not just fog turning the sky gray: SF air quality is 3 times worse than Beijing - discu.eu

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SF air quality is currently 3 times worse than Beijing https://www.sfgate.com/weather/article/air-quality-wildfire-smoke-fog-gray-breathe-health-13178427.php#photo-15808316 2 comments 24/8/2018

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Air Quality Index Scale and Color Legend https://aqicn.org/scale/ 0 comments

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