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 |
| ボツワナ | 19.67 | 19.72 | 20.57 | 22.34 | 22.68 | 22.70 | 21.23 | 21.10 | 22.05 | 21.25 | 19.97 | 19.91 | 19.20 | 18.91 |
| レソト | 26.37 | 24.50 | 20.59 | 26.34 | 26.95 | 26.52 | 25.24 | 26.80 | 25.89 | 25.37 | 22.43 | 23.02 | 21.18 | 23.44 |
| ナミビア | 20.07 | 20.44 | 19.91 | 21.80 | 23.09 | 22.56 | 21.57 | 21.06 | 22.12 | 21.06 | 19.74 | 19.97 | 19.39 | 19.99 |
| 南アフリカ | 24.57 | 24.36 | 22.50 | 24.86 | 25.00 | 24.64 | 24.16 | 24.55 | 24.60 | 24.15 | 23.75 | 23.81 | 23.19 | 23.75 |
| エスワティニ | 24.03 | 23.52 | 20.96 | 21.80 | 20.66 | 21.14 | 20.97 | 20.78 | 21.05 | 18.92 | 20.26 | 20.42 | 21.17 | 18.78 |