Indicators of Sustainable Development |
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With decreases in emissions, concentrations of pollutants other than ozone have been falling since 1990, and in most cases have continued to decrease over more recent years, although some trends may be levelling off. However, ground level rates of ozone formation are subject to fluctuation as they are heavily dependent on the weather.
There have been significant reductions in emissions of nitrogen dioxides, carbon monoxide and particulates from urban road transport. There have also been significant reductions in sulphur dioxide emissions and an associated reduction in acid deposition. Chlorine loading of ozone depletors in the stratosphere has fallen since 1994.
| Ref No | Indicator | QOLC 1999 | QOLC Updated Assessment | ||||
| Change since | Change since | ||||||
| 1970 | 1990 | 1970 | 1990 | Strategy | |||
| H10 | Air quality: Days when air pollution is moderate or higher (headline) | Urban | |
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| Rural | |
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| P1 | Concentrations of selected air pollutants | SO2, CO | |
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| NO2, Particulates | |
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| Ozone | |
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| P2 | Emissions of selected air pollutants | CO | |
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| NOX | |
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| Particulates | |
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| P3 | Sulphur dioxide and nitrogen oxides emissions | |
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| P4 | Acidification in the UK | Sulphur deposition | |
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| Sensitive lakes | |
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| P5 | Ozone depletion | Chlorine loadings from ozone depletors | |
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| Ozone levels | |
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