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
9%
81%
9%
0%
43
flagAustria
5%
79%
15%
0%
59
flagAustralia
9%
77%
8%
2%
110
flagPoland
5%
76%
15%
1%
15235
flagthe United Kingdom
11%
73%
10%
2%
340
flagGermany
11%
70%
14%
3%
320
flagUnknown
10%
65%
18%
2%
38
flagKazakhstan
8%
64%
18%
8%
37
flagSingapore
12%
64%
22%
0%
31
flagthe United States
16%
60%
17%
2%
934
flagIndia
10%
59%
26%
2%
922
flagRussia
13%
59%
25%
0%
179
flagItaly
16%
59%
13%
10%
86
flagUkraine
10%
58%
26%
3%
284
flagthe Philippines
18%
58%
18%
1%
93
flagPakistan
17%
57%
20%
2%
110
flagCanada
13%
56%
28%
1%
73
flagNigeria
21%
53%
20%
2%
78
flagSwitzerland
20%
48%
20%
9%
54
flagBelarus
17%
40%
36%
0%
47