why does acid rain occur?

1.	why does acid rain occur?
Answer» Acid rain occurs due several acidic fumes which relase from factories like sulphur dioxide etc or toxic gases. The rain known to be acidic when its pH reaches less than 5.6 When several type of Toxic gas sich as choloro floro carbon , carbon monoxide , relesed by soe and lether factory or get mixed in air. and , when rain drop fall and mix with it .Then acid rain occurred.

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