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Acid precipitation do not have immediate effects on human beings health, whereas acid tends to bring to mind the picture of caustic chemicals dissolving metals and alternative materials. Acid rain does not consists acidic enough pH to burn human skin.
Based on the study taken by U.S. Environmental Protection Agency, “As compared to people swimming or walking in clean water, swimming and walking in an acidic puddle does not causes any harm.” However, acid rain cannot burn your skin therefore it is linked to miscellaneous indirect health problems/issues.
Although, acid rain cannot harm human immediately, the sulfur dioxide creates health problems for human beings. Particularly, sulfur dioxide particles in the air can motivate chronic lung issues such as asthma and bronchitis.
In addition to this, the nitrogen oxides that generate acid rain promote the formation of ground-level ozone. While ozone high above the Earth helps block ultraviolet radiation, base level ozone promotes severe lung issues such as acute pneumonia and emphysema.

https://www.ivedahelp.com/health/acid-rain-negative-effects-on-humans-crucial-measures-to-prevent-it/