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.
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Answers by country

hydrochloric acid
sulfuric acid
nitric acid
citric acid
answers
flagAustria
3%
81%
15%
0%
33
flagMalaysia
10%
78%
10%
0%
38
flagPoland
5%
76%
15%
1%
13758
flagthe United Kingdom
10%
75%
9%
2%
264
flagAustralia
10%
74%
9%
2%
91
flagGermany
10%
71%
13%
3%
187
flagKazakhstan
4%
68%
20%
8%
25
flagSingapore
14%
67%
17%
0%
28
flagUnknown
10%
65%
18%
2%
38
flagRussia
13%
61%
23%
0%
129
flagthe United States
17%
60%
17%
2%
841
flagIndia
10%
60%
26%
2%
740
flagthe Philippines
19%
59%
15%
1%
84
flagPakistan
21%
55%
17%
3%
85
flagCanada
13%
55%
31%
0%
60
flagNigeria
20%
55%
17%
4%
45
flagUkraine
12%
54%
26%
3%
183
flagthe United Arab Emirates
15%
53%
19%
3%
26
flagSwitzerland
18%
51%
24%
3%
33
flagBelarus
21%
39%
39%
0%
33