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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 |