北京空气质量
234重度污染
0
50
100
150
200
300
500
空气很差，大家应减少外出，并关好门窗。
北京空气质量
150轻度污染
0
50
100
150
200
300
500
空气一般，敏感人员外出时，需做好防护措施。
北京空气质量
180中度污染
0
50
100
150
200
300
500
空气不好，大家外出时，需做好防护措施。
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