Is Beijing's Air Better in Summer?

Yes, compared to winter. It’s likely that during the winter months, air pollutants which would often disperse away from city centers remain locally confined due to inversion. Inversion is an atmospheric condition in which cold air is trapped beneath a layer of warm air close to the earth’s surface. Summer heat prevents this inversion.

Click here to see more explanation: https://smartairfilters.com/en/blog/us-embassy-beijing-reads-aqi-of-0-are-the-summer-skies-always-clear/

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