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
15%
65%
6%
12%
32
flagGermany
13%
59%
2%
24%
325
flagIndia
13%
55%
13%
16%
1296
flagUnknown
6%
54%
11%
27%
87
flagthe Netherlands
2%
54%
2%
40%
35
flagIndonesia
3%
54%
16%
25%
31
flagPoland
10%
52%
3%
32%
28944
flagMalaysia
9%
52%
15%
20%
72
flagPakistan
8%
51%
14%
23%
166
flagAustralia
13%
51%
9%
23%
129
flagGreece
0%
50%
6%
43%
30
flagthe United Kingdom
12%
48%
7%
29%
527
flagthe United States
13%
47%
7%
30%
1455
flagCanada
16%
45%
9%
27%
92
flagthe Philippines
13%
44%
14%
25%
151
flagthe United Arab Emirates
9%
43%
15%
31%
32
flagAustria
18%
42%
1%
36%
61
flagNigeria
19%
38%
28%
14%
78
flagRepublic of Ireland
10%
30%
12%
47%
40
flagSingapore
11%
25%
11%
52%
44