Atmospheric precipitation with a pH less than 5.6. Normal pH of precipitation is 5.6.

Rain, snow, or fog that is more acidic than pH 5.6.

Precipitation, such as rain, snow or sleet, containing relatively high concentrations of acid-forming chemicals that have been released into the atmosphere and combined with water vapor; harmful to th [..]

Précipitation acide

rain, sleet, or snow that contains a high concentration of acids. 

Rain, snow, sleet, hail or fog, usually with acidity below pH 5.6. Acidic precipitation is primarily the result of emissions of gases of sulphur and nitrogen oxides which are transformed into sulphuric acid and nitric acid respectively as they are transported over distances of hundreds to thousands of kilometres from their source. Précipitation aci [..]

Rain or snow with a pH value of less than 5.6.

Precipitation that is acidic. Acid rain is a type of acid precipitation.

Precipitation, such as rain, snow or sleet, containing relatively high concentrations of acid-forming chemicals that have been released into the atmosphere and combined with water vapor; harmful to the environment.

Rainwater or snow containing sulphur and nitrogen compounds and other pollutants associated with industrialization. See also  Acidification

Precipitation such as rain, snow or sleet, containing relatively high concentrations of acid-forming chemicals and having elevated levels of hydrogen ions (low pH). It can have harmful effects on plan [..]

Precipitation, such as rain, snow or sleet, containing relatively high concentrations of acid-forming chemicals that have been released into the atmosphere and combined with water vapor; harmful to th [..]