ಆಮ್ಲ ಮಳೆಯು ಈ pH ಮೌಲ್ಯವನ್ನು ಹೊಂದಿದೆ A. 5.5 ಅಥವಾ ಕಡಿಮೆ B. 12.5 ಅಥವಾ ಹೆಚ್ಚು C. 10.5 ಅಥವಾ ಹೆಚ್ಚು D. 8.5 ಅಥವಾ ಹೆಚ್ಚು

Normal rain is slightly acidic (pH about 5.6) because of dissolved CO₂. Rain with a pH of about 5.5 or lower is called acid rain; it is caused by sulphur dioxide and nitrogen oxides forming acids in the air.