the scale on the source image (click the picture to go to it) shows this photo to cover an length of area around Beijing of about 1000 km.
"Thick pollution obscured the sky over Beijing and nearby regions on November 4, 2005. According to news reports, the cityÂ?s pollution index reached the highest level on the scale between November 4-5, and residents were warned to spend as little time as possible outdoors. Children, elderly, and those with respiratory conditions were cautioned to be especially careful."Source: EO Newsroom
There is another image from the same source, this time about Smog and China, which I briefly noted.
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