| Site | O3 (ppb) | NO (ppb) | NO2 (ppb) | NOx (ppb) | SO2 (ppb) | CO (ppb) | CH4 (ppm) | TNMHC (ppm) | Reference |
| Yanbu Al Sinaiyah, KSA | 22.5 | 15.6 | 17.3 | 32.8 | 6.7 | 165.1 | 3.44 | 0.56 | Present study |
| Al-Taneem, KSA | 21.0 | 18.0 | - | 33.0 | 10.0 | 1386.0 | 2.15 | 0.39 | Al Jeelani (2009a) |
| Holy Makkah, KSA | 4.0 | - | - | 15.0 | 16.0 | 11300.0 | - | - | Al Jeelani (2009b) |
| Haram, Giza, Egypt | 40.0 - 79.0 | - | 89.0 - 137.0 | - | - | - | - | - | Khoder (2004) |
| Haram, Giza, Egypt | 30.0 - 64.0 | - | - | - | - | - | - | - | Khoder (2009) |
| Dokki, Giza, Egypt | - | - | 70.0 - 98.0 | - | 32.0 - 48.0 | - | - | - | Khoder (2002) |
| Eskisehir, Turkey | 19.0 | 8.0 - 16.0 | - | - | - | - | - | - | özden et al. (2008) |
| Ankara, Turkey | - | - | - | - | 11.0 | - | - | - | DRSCH (2006) |
| Nanjing, China | 20.4 | 10.6 | 18.8 | - | - | 1130.0 | 1.89 | 0.13 | Jun et al. (2007) |
| Beijing, China | - | 38.0 | - | - | 9.0 | 1970.0 | - | - | Wang et al. (2008) |
| Germany | - | 18.0 | - | - | - | - | - | - | Lewne et al. (2004) |
| Kolkata, India | - | 17.0 | - | - | - | - | - | - | Gupta et al. (2008) |
| Dhaka, Bangladesh | - | - | - | - | 45.0 | - | - | - | Gurjar et al. (2008) |
| Nagoya, Japan | - | - | - | - | - | - | - | 0.03 | Saito et al. (2009) |
| London, UK | - | - | - | - | - | - | - | 0.03 | Derwent et al.(2000) |
| Lille, France | - | - | - | - | - | - | - | 0.02 | Borbon et al. (2002) |
| Seoul, Korea | - | - | - | - | - | - | - | 0.05 | Na and Kim (2001) |