What are acid rains?

What are irate rains? Acid rain is another side-effect of civilization. As soon as pane of glass rain was discovered and understood, it was attributed to human action. (Jurgen Stock, Arthur R. Upgren, p.4)Acid rain can be called whatsoever atmospheric precipitate (rain, snow, smog, rain with snows, etc) which has the following characteristics the increased level of acids (mainly sulphuric acid) and the hydrogenous index of pH is less than average index of rain urine (average pH for rain water is 5.6), mainly it is rain with pH