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 |
| Ботсвана | 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 |
| Лесото | 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 |
| Намибия | 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 |
| Южная Африка | 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 |
| Eswatini | 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 |