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%
49
flagAustria
6%
79%
13%
0%
110
flagPoland
6%
76%
14%
1%
17084
flagthe United Kingdom
10%
72%
11%
3%
428
flagAustralia
13%
71%
9%
2%
132
flagGermany
10%
68%
15%
3%
686
flagSingapore
12%
66%
17%
2%
39
flagItaly
14%
61%
14%
9%
262
flagCanada
13%
61%
24%
0%
103
flagthe United States
16%
60%
17%
2%
1064
flagIndia
11%
58%
25%
2%
1088
flagSwitzerland
22%
57%
13%
5%
135
flagthe Philippines
19%
57%
16%
2%
112
flagUkraine
9%
56%
27%
3%
366
flagRussia
14%
56%
26%
0%
249
flagPakistan
17%
54%
22%
3%
130
flagKazakhstan
7%
53%
25%
5%
52
flagthe United Arab Emirates
12%
52%
25%
2%
40
flagNigeria
25%
48%
20%
2%
147
flagBelarus
16%
38%
37%
1%
54