§ Mr. ButlerTo ask the Secretary of State for the Environment if he will make a statement on trends in atmospheric pollution caused by(a) nitrogen dioxide and (b) low-level ozone.
§ Mr. BaldryTrends in concentrations of nitrogen dioxide and low-level ozone are described in the second and first reports respectively of the United Kingdom photochemical oxidants review group, copies of which are in the Library of the House. In some rural areas, annual mean concentrations of nitrogen dioxide doubled between 1979 and 1987. Urban areas showed no general trend. Any trends present in the levels of low-level ozone are masked by year to year variability.