Bulgaria Seasonal Pollution
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI. This pilot covers 35 eligible cities with OpenAQ-derived daily AQI history.
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Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Svishtov
214
133
72
65
100
20
61
258
181
169
268
372
Veliko Tarnovo
-
-
-
-
-
-
-
-
-
89
99
100
Razgrad
-
-
-
-
-
-
-
-
-
31
74
67
Velingrad
76
68
61
45
52
50
50
50
51
55
74
89
Botevgrad
81
78
61
39
43
46
47
46
46
54
76
83
Ruse
73
65
67
51
39
49
36
31
38
53
99
93
Targovishte
-
-
-
-
38
37
47
42
46
66
93
84
Plovdiv
90
70
61
36
39
40
40
41
39
49
74
78
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.