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
flagMalaysia
10%
81%
8%
0%
37
flagAustria
4%
79%
16%
0%
24
flagKazakhstan
5%
78%
10%
5%
19
flagPoland
5%
76%
15%
1%
13138
flagthe United Kingdom
11%
73%
10%
2%
246
flagAustralia
11%
73%
10%
2%
87
flagGermany
8%
71%
14%
4%
138
flagSingapore
14%
67%
17%
0%
28
flagUnknown
10%
65%
18%
2%
38
flagRussia
13%
61%
23%
1%
98
flagthe United States
16%
60%
17%
2%
814
flagIndia
10%
59%
26%
2%
693
flagthe Philippines
21%
57%
13%
1%
73
flagPakistan
21%
56%
16%
3%
80
flagCanada
12%
56%
31%
0%
58
flagthe United Arab Emirates
16%
56%
16%
4%
25
flagSwitzerland
16%
56%
20%
4%
25
flagNigeria
18%
55%
21%
5%
38
flagUkraine
12%
54%
26%
3%
153
flagBelarus
24%
34%
41%
0%
29