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%
115
flagPoland
6%
76%
14%
1%
17612
flagthe United Kingdom
10%
72%
11%
2%
455
flagAustralia
13%
71%
10%
2%
136
flagGermany
10%
69%
14%
2%
817
flagSingapore
12%
66%
17%
2%
39
flagItaly
12%
63%
14%
8%
316
flagCanada
13%
62%
23%
0%
106
flagthe United States
16%
60%
17%
2%
1092
flagSwitzerland
20%
59%
13%
4%
169
flagIndia
11%
58%
25%
2%
1124
flagthe Philippines
19%
57%
16%
2%
114
flagUkraine
9%
56%
27%
3%
395
flagPakistan
17%
54%
23%
3%
133
flagRussia
16%
52%
26%
0%
308
flagKazakhstan
11%
52%
26%
4%
69
flagthe United Arab Emirates
14%
50%
23%
2%
42
flagNigeria
25%
49%
20%
2%
152
flagBelarus
15%
40%
37%
1%
64