Norway Seasonal Pollution
Find each city's worst and cleanest months from daily OpenAQ-derived EPA AQI. This pilot covers 21 eligible cities with OpenAQ-derived daily AQI history.
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Seasonal EPA AQI heatmap
JanFebMarAprMayJunJulAugSepOctNovDec
Hamar
80
67
64
46
43
29
22
28
43
38
44
51
Brumunddal
85
58
51
36
39
26
20
29
35
37
56
60
Lørenskog
70
40
46
37
45
31
22
37
42
41
50
48
Porsgrunn
72
45
42
31
43
35
29
39
39
38
48
55
Oslo
62
40
45
34
44
33
28
35
41
42
52
51
Sarpsborg
78
40
45
30
39
34
29
33
44
42
46
42
Moss
63
40
45
37
47
41
28
38
59
48
35
34
Fredrikstad
92
46
47
32
36
28
21
29
36
38
45
42
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.