China Seasonal Pollution
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI. This pilot covers 6 eligible cities with OpenAQ-derived daily AQI history.
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Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Beijing
111
118
129
136
113
111
109
86
86
133
123
78
Shenyang
126
146
116
122
82
80
139
67
-
96
-
93
Huajing
164
151
129
97
79
83
58
69
57
71
-
-
Shanghai
-
-
101
84
81
72
73
72
66
76
84
122
Guangzhou
112
73
89
74
75
58
52
72
74
85
77
121
Hohhot
46
18
13
-
-
-
-
-
-
-
-
-
Methodology
The extractor maps OpenAQ monitoring locations to the nearest AQI Now city in the same country, aggregates PM2.5 and PM10 to daily city averages, and converts those concentrations to US EPA AQI. Country tool pages use only city summaries that satisfy the configured minimum daily coverage threshold.