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%
44
flagAustria
6%
78%
15%
0%
64
flagPoland
5%
76%
14%
1%
15550
flagAustralia
11%
74%
8%
2%
114
flagthe United Kingdom
11%
73%
10%
2%
353
flagGermany
11%
69%
14%
3%
359
flagUnknown
10%
65%
18%
2%
38
flagSingapore
12%
65%
21%
0%
32
flagKazakhstan
7%
63%
18%
7%
38
flagthe United States
16%
60%
17%
2%
950
flagRussia
13%
59%
25%
1%
190
flagIndia
10%
58%
26%
2%
956
flagthe Philippines
17%
58%
17%
1%
95
flagUkraine
9%
57%
25%
3%
299
flagPakistan
17%
56%
21%
2%
113
flagItaly
18%
56%
14%
10%
104
flagCanada
13%
56%
28%
1%
76
flagNigeria
21%
52%
20%
3%
89
flagSwitzerland
22%
49%
18%
8%
59
flagBelarus
17%
40%
36%
0%
47