Finland Seasonal Pollution
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI. This pilot covers 22 eligible cities with OpenAQ-derived daily AQI history.
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Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Helsinki
31
31
40
31
41
33
33
32
37
24
21
19
Pori
37
27
54
35
40
31
30
32
27
25
16
28
Kauniainen
31
32
46
30
37
31
33
29
24
22
18
16
Vantaa
32
29
35
26
33
29
29
29
35
21
18
17
Lappeenranta
29
29
26
25
30
25
27
28
28
19
22
23
Jyväskylä
23
29
30
28
34
29
32
28
22
19
12
14
Lohja
39
25
39
24
28
22
25
27
29
21
16
19
Lahti
23
25
28
32
31
26
28
25
22
18
17
14
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.