| Sampling Location | Date | NOx (ppb) | NO2 (ppb) | NO (ppb) |
| Mapipa, Dar es Salaam | Feb (1-7) 2012 | 86.3 | 21.7 | 64.5 |
| Kunduchi, Dar es Salaam | Feb (1-7) 2012 | 40.5 | 33.2 | 7.3 |
| Kunduchi, Dar es Salaam | June (1-7) 2013 | 39.5 | 17.6 | 21.9 |
| Ubungo, Dar es Salaam | June (17-23) 2013 | 1476.4 | 246.1 | 1216.8 |
| Posta, Dar es Salaam | June (17-23) 2013 | 217.1 | 117.9 | 99.2 |
| Mwetemo, Bagamoyo | Dec 13-Dec 14 | 5.1 - 12.1 | 3.5 - 11.4 | bbl - 3 |