| Indoor Air Study | Mean, µg/m3 | CV | GM or median | GSD | Upper 95% | Reference | |
| UAE | 7.7 | 1.2 | 5.8 | 2.3 | 23.3 | ||
| USA, MI (DEARS) | 18.7 | 1.1 | 13.8 | 2.2 | 49.3 | Williams et al., 2009 | |
| USA, CA (RIOPA) | 16.2 | 0.6 | 14.5 | 1.7 | 35.3 | Meng et al., 2005 | |
| USA, TX (RIOPA) | 17.1 | 0.7 | 13.4 | 1.9 | 40.0 | Meng et al., 2005 | |
| USA, NJ (RIOPA) | 20.1 | 0.8 | 15.7 | 2.0 | 48.5 | Meng, et al., 2005 | |
| Kuwait | 41.9 | 0.5 | 31.5 | 1.6 | 68.4 | Yassin et al., 2012 | |
| Alexandria, Egypt | 53.5 | 0.3 | 49.5 | 1.3 | 78.4 | Abdel-Salam et al., 2013 | |
| Hong Kong, China | 58.4 | 0.3 | 56.7 | 1.3 | 87.4 | Cao et al., 2005 | |
| Bangkok, Thailand | 137.0 | 0.2 | 131.2 | 1.2 | 184.9 | Tsai et al., 2000 | |
| Haryana, India | 718.0 | 0.5 | 568.0 | 1.6 | 1262.6 | Mukhopadhay et al., 2012 | |
| Pakistan | 2740.0 | 0.8 | 1750.5 | 2.0 | 5282.3 | Siddiqui et al., 2009 | |