Rain, snow, or any other deposition of water with an acidity greater than normal. As water falls through the air it absorbs carbon dioxide and forms carbonic acid, which has a pH of about 5.6. Higher acidity in rain or snow is observed downwind (often at significant distances) from areas with many large sources of the air contaminants sulfur dioxide and nitrogen dioxide. These oxides react with water to form sulfuric and nitric acids. Long-term deposition of these acids is linked to adverse effects on aquatic organisms and vegetation in geographical areas with poor buffering capacity within the sediments. Exposure to acid deposition also deteriorates marble and limestone buildings and statuary.
a term for the conversion of sulfur oxide and nitrogen oxide emissions into acidic compounds which precipitate in rain, snow, fog, or dry particles
acid rain Abnormally acidic (low pH) precipitation (or dry deposition) resulting from emissions of sulphur and nitrogen compounds that transform during chemical processes in the atmosphere. Acid deposition can affect the chemistry of soils and acidify lakes, adversely affecting forests and fish. A number of governments have introduced regulations focused on controlling precursor emissions of acid deposition.
acidic material that falls from the atmosphere to the earth in either wet (rain, sleet, snow, or fog) or dry (gases and particles) forms.
the deposition on the earth's surface, either in dry or wet form, of substances derived from natural and human-induced emissions of various compounds, especially those of sulfur and nitrogen which have been transformed by chemical processes in the atmosphere
The process by which acidic particles, gases, and precipitation leave the atmosphere. More commonly referred to as acid rain, acid deposition has two components: wet and dry deposition.
fallout of acidic pollutants to the earth's surface in either wet or dry forms
A comprehensive term for various ways acidic compounds precipitate from the atmosphere and deposit onto surfaces. It can include: 1) wet deposition by means of acid rain, fog, and snow; and 2) dry deposition of acidic particles (aerosols).
water that falls to or condenses on the Earth's surface as rain, drizzle, snow, sleet, hail, dew, frost, or fog with a pH of less than 5.6
A complex chemical and atmospheric process whereby recombined emissions of sulfur and nitrogen compounds are redeposited on earth in wet or dry form. See acid rain.
The transfer of acids or acid-forming substances from the atmosphere to the earth's surface.
The accumulation of acidic materials, either atmospheric (dry) or water-borne (wet) on the surface of a material; usually oxides of nitrogen or sulfur.
is precipitation (rain, snow, etc.) made acidic by the addition of sulfur dioxide and nitrogen oxides into the atmosphere as a result of fossil fuel burning. Automobile exhaust and emissions from coal-fired power plants are two significant causes of acid deposition. In severe cases, acid precipitation kills fish and other aquatic life and damages and/or destroys trees and crops. In some instances, it has rendered entire lakes and forests nearly lifeless.
air pollution produced when acid chemicals are incorporated into rain, snow, fog, or mist.
AD can be wet or dry, the wet form of which is usually referred to as acid rain, or rain with an abnormally low pH level. Dry acid deposition occurs in the form of acidic particulate matter in the air.
the falling of acids and acid-forming compounds from the atmosphere to the earth's surface. Acid deposition is commonly known as acid rain, a term that refers only to wet deposition of droplets of acids and acid-forming compounds.
A complex chemical and atmospheric phenomenon that occurs when emissions of sulfur and nitrogen compounds and other substances are transformed by chemical processes in the atmosphere, often far from the original sources, and then deposited on earth in either wet or dry form. The wet forms, popularly called "acid rain," can fall to earth as rain, snow, or fog. The dry forms are acidic gases or particulates.
The total amount of pollutants that make up what is commonly referred to as acid rain. This includes both the wet deposition and dry deposition components that settle out of the atmosphere. See "acid rain."