The data analysis we have done for Beijing, Guangzhou, Shanghai, Shenyang, and Chengdu in 2015 says it’s the afternoon–right around rush hour–that PM2.5 is the lowest. So if you’re planning a picnic or insist on exercising outside, you’re usually best off between noon and 6pm.
For data and more details, click here to read more: https://smartairfilters.com/en/blog/when-is-pm2-5-the-lowest/
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