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
flagPoland
6%
76%
14%
1%
16779
flagAustria
7%
76%
15%
0%
98
flagthe United Kingdom
10%
72%
11%
2%
417
flagAustralia
13%
71%
9%
2%
132
flagGermany
10%
69%
15%
3%
602
flagSingapore
12%
66%
17%
2%
39
flagthe United States
16%
60%
17%
2%
1045
flagCanada
13%
60%
25%
1%
99
flagIndia
11%
58%
25%
2%
1076
flagItaly
15%
58%
15%
9%
220
flagUkraine
9%
57%
26%
3%
350
flagthe Philippines
19%
57%
17%
1%
109
flagRussia
14%
56%
26%
0%
244
flagKazakhstan
8%
56%
22%
6%
48
flagPakistan
17%
55%
21%
3%
127
flagSwitzerland
22%
55%
15%
5%
110
flagthe United Arab Emirates
13%
50%
26%
2%
38
flagNigeria
25%
48%
21%
2%
142
flagBelarus
17%
38%
36%
1%
52