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%
80%
9%
0%
41
flagAustria
5%
78%
15%
0%
52
flagAustralia
9%
77%
8%
1%
108
flagPoland
5%
76%
15%
1%
14881
flagthe United Kingdom
11%
73%
10%
2%
319
flagGermany
11%
71%
13%
3%
285
flagUnknown
10%
65%
18%
2%
38
flagKazakhstan
9%
63%
21%
6%
33
flagItaly
15%
61%
12%
10%
77
flagthe United States
16%
60%
17%
2%
897
flagIndia
10%
60%
25%
1%
878
flagNigeria
15%
60%
19%
3%
66
flagUkraine
9%
59%
25%
2%
271
flagthe Philippines
18%
59%
17%
1%
88
flagRussia
13%
58%
25%
0%
173
flagPakistan
18%
56%
20%
2%
105
flagCanada
14%
55%
28%
1%
69
flagthe United Arab Emirates
16%
53%
16%
3%
30
flagSwitzerland
18%
47%
22%
8%
48
flagBelarus
19%
42%
38%
0%
42