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
7%
77%
13%
0%
93
flagPoland
6%
76%
14%
1%
16563
flagthe United Kingdom
10%
72%
11%
2%
405
flagAustralia
13%
71%
9%
2%
128
flagGermany
10%
69%
15%
3%
533
flagUnknown
10%
65%
18%
2%
38
flagCanada
13%
61%
23%
1%
96
flagthe United States
16%
60%
17%
2%
1029
flagIndia
11%
58%
25%
2%
1058
flagUkraine
9%
57%
26%
3%
340
flagthe Philippines
19%
57%
17%
0%
107
flagPakistan
17%
56%
20%
3%
123
flagKazakhstan
8%
56%
22%
6%
48
flagRussia
14%
55%
27%
0%
236
flagItaly
16%
55%
17%
10%
179
flagSwitzerland
22%
53%
17%
6%
94
flagNigeria
25%
49%
20%
2%
135
flagthe United Arab Emirates
13%
48%
27%
2%
37
flagBelarus
17%
38%
36%
1%
52