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
flagIndonesia
6%
87%
6%
0%
16
flagMalaysia
9%
83%
6%
0%
31
flagthe United Kingdom
8%
77%
9%
2%
193
flagPoland
5%
75%
15%
1%
11366
flagGermany
0%
72%
16%
8%
36
flagSingapore
9%
71%
19%
0%
21
flagAustralia
12%
70%
10%
3%
57
flagUnknown
10%
65%
18%
2%
38
flagNigeria
17%
64%
14%
3%
28
flagCanada
8%
62%
29%
0%
48
flagRussia
17%
61%
21%
0%
47
flagthe United States
17%
60%
17%
2%
725
flagIndia
10%
60%
25%
2%
549
flagthe Philippines
21%
57%
13%
1%
61
flagthe United Arab Emirates
14%
57%
19%
4%
21
flagPakistan
22%
55%
14%
4%
67
flagSpain
27%
54%
9%
0%
11
flagUkraine
13%
50%
28%
4%
81
flagSwitzerland
25%
41%
16%
8%
12
flagBelarus
22%
38%
38%
0%
18