Anything with a pH below 7.0 can be considered acidic. Scientists believe that the average pH of rain is 5.6, putting it in the acidic range. More recently, scientists have moved this estimate to 5.0 putting it at an even more acidic level.
Yes, rain is naturally acidic, around a pH of 5.5. (A pH of 7 is neutral, anything above 7 is basic, and below 7 is acidic). However, it becomes even more acidic with the addition of the burning of fossil fuels (coal and oil) by humans, generating more acidic gases into the air and making the rainwater even more acidic.
So I usually think rain as a little acidic usually because of all the chemicals that are constantly being “pumped” into the air. Some areas have more acidic rain than others. Most rain is acidic but not enough so to have a noticeable harmful impact on us.
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