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
8%
81%
10%
0%
48
flagAustria
5%
80%
13%
0%
73
flagPoland
5%
76%
14%
1%
15917
flagthe United Kingdom
10%
73%
11%
2%
377
flagAustralia
12%
72%
9%
2%
123
flagGermany
12%
68%
14%
3%
426
flagUnknown
10%
65%
18%
2%
38
flagSingapore
14%
62%
20%
2%
35
flagthe United States
16%
60%
17%
2%
991
flagthe Philippines
18%
60%
16%
0%
103
flagIndia
10%
58%
25%
2%
1020
flagUkraine
9%
58%
25%
3%
314
flagKazakhstan
9%
58%
19%
7%
41
flagRussia
13%
57%
26%
0%
208
flagPakistan
16%
57%
20%
2%
118
flagCanada
14%
56%
27%
1%
81
flagItaly
18%
55%
17%
8%
131
flagSwitzerland
22%
50%
17%
7%
67
flagNigeria
24%
47%
22%
3%
109
flagBelarus
16%
40%
36%
0%
49