§ Mr. DafisTo ask the Secretary of State for Wales if he will publish figures showing concentration rates of(a) sulphur dioxide, (b) black smoke and (c) nitrogen oxides at each monitoring site in Wales in each year since 1976; and what was the corresponding EC limit value in each case.
§ Mr. Gwilym JonesFigures showing the concentration rates of sulphur dioxide and black smoke at urban and rural air monitoring sites in Wales are on pages 98 and 99 of the "Environmental Digest for Wales No. 6 1991", copies of which are held in the Library of the House. Tables giving EC directive limit and guide values for smoke and sulphur dioxide are at page 97.
Nitrogen oxides have been monitored continuously since 1987, but no specific figures are available for Wales. However, the "Survey of Nitrogen Dioxide concentrations in the United Kingdom Using Diffusion Tubes, 1991", a copy of which is also in the Library of the House, indicates that, on the basis of the monitoring undertaken, nitrogen dioxide levels in Wales are below recommended EC directive limits.