Polluted precipitation (4,4)

I believe the answer is:

acid rain

'polluted precipitation' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for acid rain that I've seen before include "What's ecologically damaging" , "Polluted water" , "Harmful drops" , "Destructive precipitation" , "Devastating drop" .)

I've seen this clue in The Sun, The Independent and The Telegraph.

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