HC Deb 10 February 1992 vol 203 cc341-2W
Mr. Corbyn

To ask the Secretary of State for the Environment if he will give the air quality results for central London for June and December each year from 1980 to the present for carbon dioxide, carbon monoxide, sulphur dioxide and low-level ozone and any other relevant measurements for which he has results.

Mr. Baldry

The table shows the average figures for the months of June and December at the central London site, With the maximum hourly level reached in that month for carbon monoxide (CO), sulphur dioxide (SO2), ozone (O3)and nitrogen dioxide (NO2). No measurement data in this format are available for carbon dioxide.

CO ppm
Average Maximum
Year June December June December
1980 0.6 0.9 3.1 4.6
1981 0.7 1.7 3.8 7.1
1982 0.6 1.0 3.3 3.4
1983 — 1.0 — 6.2
1984 0.8 1.4 4.3 11.5
1985 0.5 0.7 3.2 4.0
1986 0.7 — 3.8 —
1987 — — — —
1988 0.7 1.5 2.5 8.1
1989 0.9 1.9 2.8 13.1
1990 0.9 1.5 4.2 11.7
1991 1.1 2.2 3.6 13.3
SO2 ppb
Average Maximum
Year June December June December
1980 26 21 150 152
1981 15 58 98 339
1982 24 36 281 238
1983 17 34 142 133
1984 16 16 295 379
1985 7 7 31 16
1986 16 16 178 68
1987 7 14 47 153
1988 6 14 76 57
1989 10 15 125 190
1990 9 11 86 72
1991 5 18 54 144
O3 ppb
Average Maximum
Year June December June December
1980 14 2 42 10
1981 13 2 63 16
1982 — 5 — 23
1983 13 — 49 —
1984 17 1 68 7
1985 22 12 84 59
1986 21 5 105 26
1987 6 3 35 21
1988 10 4 59 29
1989 19 5 108 33
1990 12 7 67 30
1991 13 4 47 18
NO2 ppb
Average Maximum
Year June December June December
1980 32 34 88 72
1981 — 42 — 103
1982 40 38 98 78
1983 37 39 101 114
1984 42 — 156 —
1985 34 29 108 75
1986 33 36 141 77
1987 37 38 90 239
1988 33 33 100 92
1989 40 34 108 125
1990 28 39 86 150
1991 34 56 84 423

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