acid rain

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acid rain

the precipitation of moisture, as rain, with high acidity caused by release into the atmosphere of pollutants from industry, motor vehicle exhaust, and other sources. Acid precipitation with a pH of 5.6 or lower is blamed by various authorities for numerous human health problems, fish kills, and the destruction of timber. Also called acid precipitation, acid snow.See also acid dust,acid flush,and acid mist.
Precipitation laced with pollution, produced predominantly by power plants that burn coal of variable purity, generating SO2 and NO2, lowering the pH of precipitation

acid rain

any rain that contains pollutants such as dissolved sulphur compounds, and as a result adversely affects plant and animal life on precipitation. The pollutants are released into the atmosphere by the burning of fossil fuels such as coal or oil.

acid rain

rain which contains materials, sulfates and oxidation products of nitrogen and sulfur particularly, produced by combustion of coal and oil in industrial processes and by motor vehicles; lowers the pH of water bodies; see acid waters; credited with local decline of fish culture.
References in periodicals archive ?
The Statement of Issues cited thirteen issues--including whether it was arbitrary "for the Administrator to ignore acid deposition impacts upon sensitive and critically sensitive aquatic and terrestrial resources in establishing a system for the allocation, transfer, use and tracking of sulfur-dioxide allowances.
Acid deposition, for example, is limited to the reduced effects on recreational fishing yields, and fails to consider the broader impacts on forests, crops/vegetation, and cultural/historic materials.
This identification process is possible even when acid deposition travels hundreds of kilometers from its source.
The report also signals an important shift from a focus on sulfur dioxide emissions and acid deposition to a broader perspective that includes a much wider range of potential pollutants, such as ozone, volatile hydrocarbons and toxic heavy metals (SN: 7/18/87, p.
Although Minnesota Pollution Control Agency researchers believe that aquatic resources are the most sensitive, increasing research may show that the forests of canoe country are also at risk from acid deposition.
My general impression is that thelinkage between acid deposition and aquatic effects has become stronger,' says Cowling.
If any villain has been caught with a smoking gun during these three years of intense study, it's not sulfur or nitrogen in acid deposition, but ozone.
The NAS study released last week, "Acid Deposition: Long-Term Trends," suggests that in certain cases, none of the alternative explanations accounts for lake acidity as fully as the effect of sulfur dioxide emissions from the burning of fossil fuels and the resulting acid deposition.
The solution to the acid deposition problem must represent a 'win-win' situation for both the Northeast and the Midwest," says McCormick.
6) indicates that fertilizers rich in ammonium ions in particular, together with the enchanced biological activity promoted by any nitrogen fertilizer, acidify soil more than acid deposition does.
The Mesa Verde project is only one of several ongoing studies designed to examine the effects of acid deposition on materials.
At the same time, National Acid Deposition Program (NADP) stations in Colorado, Wyoming and Idaho were measuring the concentration of various ions found in precipitation.