PM2.5 air pollution, mean annual exposure (micrograms per cubic meter)
| 1990 | 2000 | 2005 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 |
| 日本 | 13.37 | 13.16 | 12.32 | 10.85 | 12.27 | 12.81 | 13.25 | 13.74 | 12.87 | 12.80 | 13.12 | 13.08 | 12.94 | 12.84 |
| フランス | 18.31 | 16.09 | 14.89 | 13.78 | 13.80 | 12.56 | 12.46 | 10.69 | 11.34 | 10.51 | 10.46 | 10.46 | 9.83 | 9.60 |
| ドイツ | 22.53 | 18.15 | 16.55 | 16.20 | 15.72 | 13.91 | 13.66 | 12.28 | 12.83 | 11.78 | 11.90 | 11.65 | 10.64 | 10.29 |
| イタリア | 29.06 | 26.25 | 23.34 | 20.17 | 21.34 | 18.77 | 18.05 | 16.89 | 17.76 | 15.70 | 15.97 | 16.34 | 14.89 | 14.66 |
| 英国 | 18.66 | 16.11 | 14.47 | 12.46 | 13.01 | 11.48 | 11.39 | 10.81 | 10.46 | 10.04 | 10.38 | 10.24 | 9.95 | 9.91 |
| カナダ | 10.55 | 9.80 | 9.57 | 7.80 | 7.37 | 7.59 | 7.26 | 7.38 | 7.12 | 6.41 | 7.04 | 7.09 | 6.23 | 6.57 |
| アメリカ合衆国 | 14.10 | 12.76 | 11.75 | 9.28 | 9.36 | 9.01 | 8.75 | 8.51 | 8.19 | 7.41 | 7.79 | 7.82 | 7.18 | 7.81 |