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Definitions (114)

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pm2.5


P
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a


B
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abatement of pollutants


the reduction in degree or intensity, or elimination, of pollution; this includes emission reductions by developing clean systems as well as reduction through altered source sector activity.
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acid deposition


Atmospheric input to ecosystems of pollutants which may acidify soils and freshwaters; this includes species derived from SO2
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acid neutralising capacity


Measure of ability of water or soil to resist changes in pH. An important chemical parameter used in critical load
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acid rain


Precipitation which has been rendered (made) acidic by airborne pollutants; Also see Acid deposition
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acidification


a decrease in pH of surface waters and soils. As soils naturally become acidified over time; acidification generally refers to the enhanced changes due to anthropogenic deposition of sulphur and nitrogen species.
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acidification strategy


1997 EU strategy that aims to significantly reduce the areas under threat from critical loads exceedance of acidity in the European Union by 2010. This includes the establishment of national emission ceilings for acid rain pollutants (sulphur dioxide
Source: apis.ac.uk

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acute effect


An adverse effect on any living organism in which severe symptoms develop rapidly and often subside after the exposure stops; occurring over a short period of time; used to describe brief exposures and effects which appear promptly after exposure. Also see: Chronic effect
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aerosol


a suspension of small size (generally under one micron) liquid or solid particles in air gas.
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