Strange fog in Shanghai

It’s been 3 to 4 days that there’s a really dense and strange fog in Shanghai, most of the people around me are complaining about strange feeling about their throat.

Today it’s children day, and the Chinese CCTV said it’s a Yellow alert (about the air quality), and recommend elder people and children to no stay outside too long, but they wouldn’t say why, they just add that yellow alert is before the red alert…good to know

This is a picture took with my mobile from my office:

And from another spot

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