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
7%
77%
15%
0%
100
flagPoland
6%
76%
14%
1%
16913
flagthe United Kingdom
10%
72%
11%
3%
420
flagAustralia
13%
71%
9%
2%
132
flagGermany
10%
68%
15%
3%
644
flagSingapore
12%
66%
17%
2%
39
flagthe United States
16%
60%
17%
2%
1056
flagCanada
13%
60%
24%
0%
101
flagIndia
11%
58%
25%
2%
1085
flagItaly
15%
58%
15%
9%
237
flagthe Philippines
19%
58%
17%
1%
110
flagUkraine
9%
57%
27%
3%
357
flagSwitzerland
22%
57%
13%
4%
123
flagRussia
14%
55%
27%
0%
246
flagPakistan
17%
55%
21%
3%
129
flagKazakhstan
7%
54%
23%
5%
51
flagthe United Arab Emirates
12%
51%
25%
2%
39
flagNigeria
25%
48%
20%
2%
143
flagBelarus
16%
39%
35%
1%
53