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
13%
66%
6%
13%
30
flagGermany
12%
59%
2%
25%
290
flagIndonesia
3%
56%
13%
26%
30
flagIndia
13%
55%
13%
16%
1250
flagUnknown
6%
54%
11%
27%
87
flagPoland
10%
52%
3%
32%
28562
flagMalaysia
10%
52%
16%
19%
67
flagthe Netherlands
2%
52%
2%
41%
34
flagPakistan
8%
50%
13%
23%
159
flagGreece
0%
50%
6%
43%
30
flagAustralia
15%
49%
10%
23%
116
flagthe United Kingdom
11%
48%
8%
29%
476
flagthe United States
13%
47%
7%
30%
1434
flagCanada
15%
45%
10%
27%
90
flagthe United Arab Emirates
9%
45%
16%
29%
31
flagthe Philippines
13%
44%
14%
25%
147
flagNigeria
17%
42%
30%
9%
63
flagAustria
20%
40%
1%
36%
55
flagRepublic of Ireland
11%
32%
14%
41%
34
flagSingapore
11%
25%
11%
51%
43