asked the Secretary of State for the Environment what are the levels of atmospheric pollution in Walsall, Hartlepool, Blackburn, Rochdale, Sefton, St. Helens, Wigan, Barnsley, Doncaster, Rotherham, Sandwell, Brent, Ealing, Haringey and Wandsworth, respectively.

The only atmospheric pollutants for which information is readily available for the areas mentioned are smoke and sulphur dioxide. The table below gives annual mean figures of concentrations in microgrammes per cubic metre for 1976–77 except in the cases of Brent and Wandsworth, where the figure for 1976–77 has been estimated on the basis of results for 1975–76.