Acid clouds can grow on SO2 emissions from refineries, as seen here in Curaçao. It can have harmful effects on plants, aquatic animals and infrastructure. Distilled water, once GEF primary education text to read dioxide is removed, has a neutral pH of 7.
The corrosive effect of polluted, acidic city air on limestone and marble was noted in the 17th century by John Evelyn, who remarked upon the poor condition of the Arundel marbles. Though acidic rain was discovered in 1853, it was not until the late 1960s that scientists began widely observing and studying the phenomenon. The term “acid rain” was coined in 1872 by Robert Angus Smith. Canadian Harold Harvey was among the first to research a “dead” lake.