acid rain
US /ˈæs.ɪd ˌreɪn/
UK /ˈæs.ɪd ˌreɪn/

1.
hujan asam
rain that is unusually acidic, meaning that it possesses elevated levels of hydrogen ions (low pH). It is caused by emissions of sulfur dioxide and nitrogen oxide which react with water molecules in the atmosphere to produce acids.
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The factory's emissions are contributing to acid rain in the region.
Emisi pabrik berkontribusi terhadap hujan asam di wilayah tersebut.
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Acid rain can damage forests and aquatic ecosystems.
Hujan asam dapat merusak hutan dan ekosistem akuatik.