What is inside Swiss cheese holes?

nitrogen
carbon dioxide
water vapor
air
Carbon dioxide is produced by bacteria feeding on the lactic acid. In the Middle Ages, the holes were considered a sign of imperfection and cheese makers would try to avoid them.
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Answers by country

nitrogen
carbon dioxide
water vapor
air
answers
flagSwitzerland
18%
58%
4%
20%
50
flagItaly
5%
58%
8%
27%
36
flagthe Netherlands
2%
56%
4%
36%
46
flagIndia
12%
54%
14%
16%
1519
flagUnknown
6%
54%
11%
27%
87
flagIndonesia
3%
54%
16%
25%
31
flagMalaysia
10%
53%
15%
19%
83
flagPoland
10%
52%
3%
32%
30037
flagGermany
13%
52%
3%
29%
605
flagAustralia
13%
51%
10%
23%
155
flagthe United Kingdom
12%
48%
7%
29%
624
flagPakistan
10%
48%
14%
23%
184
flagthe United Arab Emirates
11%
47%
13%
27%
36
flagthe United States
13%
46%
7%
31%
1560
flagthe Philippines
12%
44%
13%
28%
175
flagCanada
14%
42%
11%
29%
107
flagAustria
19%
40%
2%
35%
97
flagRepublic of Ireland
12%
38%
9%
38%
54
flagNigeria
14%
37%
28%
19%
134
flagSingapore
14%
27%
10%
47%
48