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
flagthe Netherlands
2%
55%
4%
38%
47
flagItaly
5%
55%
7%
31%
38
flagIndia
13%
54%
14%
16%
1569
flagUnknown
6%
54%
11%
27%
87
flagGermany
13%
53%
3%
28%
747
flagMalaysia
10%
53%
15%
19%
84
flagPoland
10%
52%
3%
32%
30394
flagSwitzerland
16%
52%
4%
22%
61
flagAustralia
13%
51%
10%
22%
158
flagNew Zealand
5%
51%
14%
28%
35
flagthe United Kingdom
12%
49%
7%
29%
663
flagPakistan
10%
48%
14%
23%
194
flagthe United States
13%
46%
7%
31%
1593
flagthe United Arab Emirates
9%
46%
12%
31%
41
flagthe Philippines
11%
43%
13%
28%
176
flagAustria
21%
42%
1%
32%
119
flagCanada
13%
41%
13%
30%
122
flagNigeria
15%
38%
25%
20%
159
flagRepublic of Ireland
12%
38%
9%
40%
55
flagSingapore
15%
28%
9%
47%
53