Which acid mostly contributes to acid rains?

hydrochloric acid
sulfuric acid
nitric acid
citric acid
The most important gas which leads to acidification is sulfur dioxide, coming from fossil fuel combustion and industry (and, in lesser amounts, from volcanoes and wildfires). In recent years, emissions of nitrogen oxides which are oxidized to form nitric acid are of increasing importance due to stricter controls on emissions of sulfur containing compounds.
Cleo
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Answers by country

hydrochloric acid
sulfuric acid
nitric acid
citric acid
answers
flagAustria
6%
79%
14%
0%
48
flagMalaysia
10%
79%
10%
0%
39
flagAustralia
9%
77%
8%
1%
105
flagPoland
5%
76%
15%
1%
14585
flagthe United Kingdom
11%
74%
9%
2%
304
flagGermany
11%
70%
14%
3%
254
flagSingapore
13%
68%
17%
0%
29
flagUnknown
10%
65%
18%
2%
38
flagKazakhstan
9%
63%
21%
6%
33
flagthe United States
16%
60%
17%
2%
880
flagIndia
10%
60%
25%
1%
828
flagRussia
13%
59%
25%
0%
159
flagUkraine
10%
58%
25%
3%
258
flagthe Philippines
18%
58%
17%
1%
87
flagItaly
17%
58%
11%
11%
68
flagNigeria
17%
57%
19%
3%
56
flagCanada
14%
55%
28%
1%
69
flagPakistan
19%
54%
20%
3%
97
flagSwitzerland
16%
53%
23%
4%
43
flagBelarus
21%
39%
39%
0%
38