United Kingdom concentrations of benzene in outdoor air (μg/m3) from passive monitoring networks
| Location | Sites (n) | Concentration | Comment | Reference |
| Urban, London | 1 | 3.2–43.53-150 | Monthly average | EPAQS (1994)59 |
| Outdoor, general3-151 | 59 | 1.6–7.043-150 | Mean ranges over 6 months | Downing et al (1994)86 |
| Outdoor, Avon | 13 | 5 | Annual mean | Brown and Crump (1996)62 |
| Roadside (<20 m) | NR | 10–453-150 3-153 | Averaging time not reported | DoE (1997)60 |
| Semirural, Manchester | 2 | 0.86–1.953-150 3-152 | Annual running mean | |
| Urban, Manchester | 3 | 1.28–3.143-150 3-152 | Annual running mean | |
| Road side, Manchester | 2 | 1.92–6.853-150 3-152 | Annual running mean |
NR=number of sites not reported.
↵3-150 Values reported as ppb.
↵3-151 This survey was conducted over a 6 month period in 1992 and measured various hydrocarbons at 59 sites with diffusion tubes.
↵3-152 Based on data supplied by Environmental Health Division, Technical Services Department, Manchester City Council, Town Hall, Manchester M60 2JT. Benzene monitoring has been conducted by Manchester City Council at seven locations since 1994. Data presented here are for the period January 1995–July 1997. The methodology involves passive sampling to obtain 2-weekly as well as annual running averages.
↵3-153 Passive sampling with diffusion tubes.