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
12%
59%
2%
25%
310
flagIndia
13%
55%
13%
16%
1286
flagUnknown
6%
54%
11%
27%
87
flagthe Netherlands
2%
54%
2%
40%
35
flagIndonesia
3%
54%
16%
25%
31
flagPoland
10%
52%
3%
32%
28812
flagMalaysia
10%
52%
15%
20%
70
flagPakistan
8%
50%
14%
23%
164
flagAustralia
14%
50%
9%
23%
126
flagGreece
0%
50%
6%
43%
30
flagthe United Kingdom
11%
48%
7%
29%
509
flagthe United States
13%
47%
7%
30%
1447
flagCanada
15%
46%
9%
27%
91
flagthe United Arab Emirates
9%
45%
16%
29%
31
flagthe Philippines
13%
44%
14%
26%
150
flagAustria
18%
42%
1%
35%
59
flagNigeria
19%
40%
29%
9%
71
flagRepublic of Ireland
10%
30%
12%
46%
39
flagSingapore
11%
25%
11%
51%
43