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Average air quality measurements in April of the years 2015–2020 from NASA OMI and ground monitoring stations
| 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | |
|---|---|---|---|---|---|---|
| NASA OMI | ||||||
| NO2 at all pixels (1016molecules/cm2) | 0.16 | 0.15 | 0.14 | 0.13 | 0.14 | 0.12 |
| NO2 at ground sites (1016molecules/cm2) | 0.32 | 0.31 | 0.28 | 0.29 | 0.29 | 0.23 |
| Ground monitoring stations | ||||||
| NO2 (ppb) | 8.16 | 7.69 | 7.22 | 7.62 | 7.0 | 5.52 |
| PM2.5 (μg/m3) | 6.52 | 6.36 | 6.02 | 6.60 | 5.82 | 6.31 |
