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%
80%
14%
0%
56
flagAustralia
9%
77%
8%
2%
110
flagPoland
5%
76%
15%
1%
15081
flagthe United Kingdom
11%
73%
10%
2%
334
flagGermany
12%
69%
14%
2%
306
flagUnknown
10%
65%
18%
2%
38
flagSingapore
12%
64%
22%
0%
31
flagKazakhstan
8%
62%
20%
8%
35
flagthe United States
16%
60%
17%
2%
920
flagIndia
10%
59%
26%
1%
900
flagRussia
13%
59%
25%
0%
174
flagthe Philippines
18%
59%
16%
1%
91
flagUkraine
10%
58%
25%
3%
275
flagItaly
16%
58%
15%
10%
80
flagPakistan
17%
56%
21%
2%
109
flagNigeria
21%
55%
19%
2%
76
flagCanada
13%
55%
29%
1%
72
flagSwitzerland
18%
46%
22%
10%
49
flagBelarus
17%
41%
34%
0%
46