§ Mr. MaxtonTo ask the Secretary of State for Scotland if he will provide the most recent figures on air pollution levels in Scotland in each of the last five years.
§ Lord James Douglas-Hamilton[holding answer 6 March 1992]: The most recent published information on air
Table 1—Nitrogen Dioxide Jan. Feb. March April May June July Aug. Sept. Oct. Nov. Dec. (a) Glasgow 1987 34 38 35 35 28 30 24 23 24 33 35 38 1988 31 33 34 38 32 26 22 24 25 31 36 28 1989 23 23 25 32 24 24 26 20 24 29 35 38 1990 19 21 21 30 32 27 24 21 26 26 30 27 1991 24 29 29 26 26 25 24 21 27 27 26 30 (b) Strath Vaich—Ross and Cromarty 1990 — — — — — — — — — 1.9 0.9 0.6 1991 2.1 2.3 3.8 1.4 0.9 1.3 2.1 1.3 0.5 1.7 0.7 1.5 Note: All measurements expressed as parts per billion (ppb).
464Win each of the local enterprise company areas served by Scottish Enterprise and for Highlands and Islands and Scotland as a whole.
pollution can be found at section 3 of "The Scottish Environment—Statistics" Issue No. 2 (1989). The next issue will be published shortly.
Warren Spring Laboratory also compiles data on the atmospheric concentrations of a number of substances from a United Kingdom-wide network of monitoring stations. The available data from the Scottish sites are set out in tables 1 to 5. All data are expressed as average hourly readings for each month for the available years.
465W
Table 2—Nitric Oxide Jan. Feb. March April May June July Aug. Sept. Oct. Nov. Dec. (a) Glasgow 1987 84 104 38 21 19 25 23 33 33 80 92 122 1988 68 38 43 47 34 36 30 29 37 86 108 42 1989 24 28 36 46 25 31 31 25 48 38 126 195 1990 33 27 24 37 43 31 31 26 44 60 157 104 1991 83 97 65 32 32 35 34 32 47 78 76 135 (b) Strath Vaich 1990 — — — — — — — — — 0.1 0.1 0.1 1991 0.2 0.4 0.5 0.3 0.1 0.3 1.1 0.8 0.1 0.2 0.3 0.3 Note: All measurements are expressed as parts per billion (ppb).
Table 3—Carbon Monoxide Jan. Feb. Mar April May June July Aug. Sept. Oct. Nov. Dec. Glasgow 1989 — — — — — — 0.6 0.7 1.0 1.1 2.2 3.1 1990 0.9 0.8 0.7 0.8 0.9 0.8 0.7 0.7 0.9 1.2 2.5 1.8 1991 1.2 1.5 1.3 1.0 1.1 1.0 1.0 1.0 1.4 1.6 1.9 2.4 Note: All measurements expressed as parts per million.
Table 4—Sulphur Dioxide Jan. Feb. Mar. April May June July Aug. Sept. Oct. Nov. Dec. Strath Vaich 1990 — — — — — — — — — 0.7 0.3 0.2 1991 1.4 1.7 1.2 0.6 0.1 0.2 0.5 0.2 n.a. 1.2 0.3 0.6 Note: All measurements expressed as parts per billion (ppb).
Table 5—Ozone Jan Feb March April May June July Aug Sept Oct Nov Dec (a) Penicuik 1987 16 18 27 36 34 24 23 20 20 17 17 17 1988 22 29 28 28 37 30 29 25 26 22 22 28 1989 29 32 35 33 35 29 28 24 22 24 18 15 1990 28 34 36 35 31 29 26 22 23 23 19 24 1991 20 20 20 28 22 25 27 26 24 20 22 17 (b) Eskdalemuir 1987 16 19 21 31 30 21 21 19 15 17 17 18 1988 20 25 30 26 34 30 28 24 24 22 18 26 1989 26 30 34 35 34 31 31 25 23 24 18 19 1990 26 35 35 35 36 30 28 22 22 23 19 23 1991 19 25 25 33 27 27 31 28 27 22 22 15 (c) Strath Vaich 1987 — — 41 42 29 34 29 29 30 28 26 28 1988 28 36 36 37 44 31 32 28 34 32 33 36 1989 36 38 33 35 42 33 27 25 28 32 28 27 1990 30 36 38 40 40 36 30 27 30 31 27 31 1991 31 32 32 43 39 34 35 32 27 25 25 20 Note: All measurements are expressed as parts per billion (ppb).