Annual mean benzene concentrations in all background locations in 2009 are predicted to be well within the proposed limit value of 5 m gm^-3.

Estimated annual mean roadside benzene concentrations in 2009 are expected to be considerably higher. Very few road links are expected to have concentrations higher than 1.542 ppb by 2006 and very few are expected to have concentrations greater than the limit value with a 20% safety margin (1.234 ppb) by 2008. The majority of the road links with the highest estimated benzene concentrations are in central London.

Comparison with limit value         Acknowledgement