happesademed - peamiselt gaasiliste väävel- ja lämmastikoksiidide veepiisakestes lahustumisest tuleneva happelise reaktsiooniga sademed. Happesademed põhjustavad saasteainete sadenemist ka saasteallikast kaugel. Happelised lumesajud ja udud ning happeline kaste (viimast on eriti mägistel aladel) on lokaalsemad kui happevihmad.
rain (or snow) which contains a higher level of acid than normal
Recognizing furthermore that Canada will undertake further reductions of emissions of sulphur by 2010 through the implementation of the Canada-wide Acid Rain Strategy for Post-2000, and that the United States is committed to the implementation of a nitrogen oxides reduction programme in the eastern United States and to the reduction in emissions necessary to meet its national ambient air quality standards for particulate matter ...
