To ask the Secretary of State for the Environment (1) pursuant to the answer of 1 May, Official Report, columns 502–3, if he will give comparable figures on nitrogen dioxide, ozone and acidity of rain at each of the monitoring sites then in operation for each year since 1979; (2) pursuant to the answer of 1 May, Official Report, columns 502–3, if he will give comparable figures for suphur dioxide concentrations in each region for every year since 1979.
The information requested is in the table. Additional data have been published in the relevant Department of the Environment scientific review group and other reports: "Ozone in the United Kingdom" (United Kingdom photochemical oxidants review group), "Acidity in United Kingdom Fresh Waters" (United Kingdom acid waters review group second report), "Acid Deposition in the United Kingdom" (United Kingdom review group on acid rain second report) and "Lake Acidification in the United Kingdom" (paleoecology research unit, University College London). Copies of these publications have been placed in the Library of the House.
A. NO2 annual mean (am) and 98th percentile (98 percentile):
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Units: parts per billion (ppb).
| |||||||||||
Site
| 1979
| 1980
| 1981
| 1982
| 1983
| 1984
| 1985
| 1986
| 1987
| 1988
| 1989
|
EC Directive sites
| |||||||||||
Central London
| |||||||||||
am | 34 | 33 | 35 | 43 | 39 | 43 | 32 | 35 | 39 | 35 | 39 |
98 percentile | 64 | 66 | 71 | 110 | 73 | 81 | 63 | 64 | 85 | 74 | 80 |
West London
| |||||||||||
am | — | — | — | — | — | — | — | — | 35 | 37 | 42 |
98 percentile | — | — | — | — | — | — | — | — | 84 | 92 | 112 |
Glasgow
| |||||||||||
am | — | — | — | — | — | — | — | — | 31 | 30 | 27 |
98 percentile | — | — | — | — | — | — | — | — | 69 | 57 | 61 |
Manchester
| |||||||||||
am | — | — | — | — | — | — | — | — | 29 | 28 | 25 |
98 percentile | — | — | — | — | — | — | — | — | 65 | 67 | 62 |
Walsall
| |||||||||||
am | — | — | — | — | — | — | — | — | 30 | 26 | 29 |
98 percentile | — | — | — | — | — | — | — | — | 62 | 54 | 59 |
Billingham
| |||||||||||
am | — | — | — | — | — | — | — | — | 23 | 21 | 22 |
98 percentile | — | — | — | — | — | — | — | — | 63 | 58 | 60 |
Non Directive sites:
| |||||||||||
Cromwell Road
| |||||||||||
am | 36 | — | — | 46 | 68 | 50 | 48 | 40 | — | — | 45 |
98 percentile | 82 | — | — | 117 | 209 | 119 | 128 | 109 | — | — | 105 |
Stevenage
| |||||||||||
am | 24 | 18 | 19 | 22 | 20 | 23 | — | 21 | 27 | 24 | 25 |
98 percentile | 71 | 43 | 50 | 54 | 47 | 57 | — | 52 | 72 | 53 | 56 |
B. Ozone: exceedances of 60pph hourly average
| |||||||||||
Site
| 1979
| 1980
| 1981
| 1982
| 1983
| 1984
| 1985
| 1986
| 1987
| 1988
| 1989
|
Stevenage | 64 | 11 | 7 | 242 | 178 | 324 | 108 | 89 | 36 | 10 | 85 |
Central London | 29 | 15 | 31 | 10 | 6 | 6 | 146 | 68 | 9 | 3 | 74 |
Sibton | 66 | 2 | 358 | 157 | 207 | 72 | 63 | — | 46 | 76 | 212 |
Aston Hill | — | — | — | — | — | — | — | 47 | 45 | 83 | 143 |
Lullington Heath | — | — | — | — | — | — | — | 0 | 106 | 112 | 401 |
Strath Vaigh | — | — | — | — | — | — | — | — | 32 | 53 | 28 |
High Muffles | — | — | — | — | — | — | — | — | 0 | 49 | 184 |
Lough Navar | — | — | — | — | — | — | — | — | 34 | 49 | 74 |
Yarner Wood | — | — | — | — | — | — | — | — | 21 | 51 | 360 |
Ladybower | — | — | — | — | — | — | — | — | — | 20 | 173 |
Harwell | — | — | — | — | 117 | 173 | 70 | 77 | 51 | 16 | 170 |
Bottesford | 503 | 458 | 54 | 238 | 138 | 201 | 94 | 93 | 59 | 10 | 82 |
Bush | — | — | — | — | — | — | — | 11 | 53 | 33 | 63 |
Eskdalemuir | — | — | — | — | — | — | — | 30 | 49 | 28 | 99 |
Great Dun Fell | — | — | — | — | — | — | — | 96 | 167 | 131 | 204 |
Wharley Croft | — | — | — | — | — | — | — | 21 | 36 | 34 | 129 |
Glazebury | — | — | — | — | — | — | — | — | — | 22 | 39 |
C. Acidity of rain as precipitation weighted mean acidity in microgramme equivalents per litre: | ||||
Site
| 1986
| 1987
| 1988
| 1989
|
Achanarras | — | 19 | 25 | 25 |
Strath Vaigh Dam | — | 16 | 16 | 13 |
River Mharcaidh | 22 | 22 | 21 | 20 |
Glen Dye | — | 45 | 46 | 36 |
Balquhidder | 21 | 32 | 24 | 20 |
Whiteadder | 40 | 36 | 47 | 35 |
Eskdalemuir | 21 | 25 | 27 | 20 |
Redesdale | 41 | 44 | 52 | 33 |
Loch Dee | 29 | 23 | 19 | 15 |
Cow Green Reservoir | 27 | 31 | 34 | 23 |
Bannisdale | 30 | 27 | 28 | 24 |
High Muffles | — | 63 | 72 | 55 |
Thorganby | 75 | 73 | 88 | 84 |
Jenny Hum | 89 | 100 | 85 | 64 |
Driby | 42 | 43 | 42 | 47 |
Wardlow Hay Cop | 29 | 45 | 33 | 37 |
Site
| 1986
| 1987
| 1988
| 1989
|
Beddgelert | 17 | 19 | 17 | 15 |
Bottesford | 61 | 76 | 81 | 48 |
Plynlimon | — | 15 | 11 | 14 |
Stoke Ferry | 35 | 36 | 30 | 40 |
Preston Montford | 18 | 25 | 25 | 36 |
Llyn Brianne | 16 | 21 | 18 | 19 |
Tycanol Wood | 16 | 17 | 15 | 18 |
Woburn | 45 | 51 | 37 | 37 |
Flatford Mill | 33 | 43 | 35 | 35 |
Compton | 25 | 28 | 16 | 25 |
Barcombe Mills | 19 | 22 | 13 | 15 |
Yarner Wood | 17 | 20 | 14 | 20 |
Goonhilly | 20 | 23 | 15 | 19 |
Lough Navar | 11 | 10 | 10 | 10 |
Hillsborough Forest | — | — | — | 13 |
Isle of Man | 28 | 34 | 27 | 24 |
D. SO2 concentrations by region | |||||||||
Units: microgrammes per cubic meter
| |||||||||
Region
| 1979–80
| 1980–81
| 1981–82
| 1982–83
| 1983–84
| 1984–85
| 1985–86
| 1986–87
| 1987–88
|
Scotland | 60 | 49 | 53 | 40 | 40 | 43 | 38 | 36 | 32 |
North | 54 | 42 | 43 | 35 | 33 | 30 | 30 | 33 | 35 |
North West | 84 | 63 | 63 | 49 | 48 | 44 | 39 | 38 | 41 |
Yorks/Humber | 86 | 69 | 78 | 68 | 67 | 59 | 57 | 51 | 50 |
East Midlands | 76 | 58 | 65 | 54 | 54 | 47 | 45 | 47 | 46 |
West Midlands | 73 | 61 | 64 | 54 | 57 | 49 | 44 | 44 | 39 |
Wales | 48 | 41 | 39 | 35 | 35 | 36 | 28 | 26 | 24 |
East Anglia | 51 | 50 | 50 | 35 | 34 | 28 | 25 | 27 | 24 |
London | 78 | 68 | 66 | 55 | 47 | 48 | 39 | 42 | 37 |
South East | 57 | 50 | 46 | 39 | 37 | 38 | 37 | 37 | 31 |
South West | 49 | 45 | 43 | 37 | 35 | 34 | 37 | 34 | 25 |
Northern Ireland | 47 | 40 | 47 | 56 | 46 | 58 | 64 | 70 | 67 |