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
flagGermany
12%
59%
2%
25%
197
flagIndonesia
3%
58%
10%
27%
29
flagIndia
13%
55%
13%
16%
1131
flagUnknown
6%
54%
11%
27%
87
flagPakistan
9%
52%
13%
22%
148
flagPoland
10%
51%
3%
33%
27693
flagNigeria
15%
50%
25%
9%
44
flagthe Netherlands
3%
50%
3%
43%
30
flagthe United Kingdom
10%
49%
8%
28%
439
flagMalaysia
11%
49%
16%
21%
61
flagGreece
0%
47%
8%
43%
23
flagthe United States
13%
46%
7%
30%
1390
flagAustralia
16%
46%
9%
25%
103
flagthe United Arab Emirates
10%
46%
16%
26%
30
flagCanada
14%
45%
9%
28%
87
flagGhana
19%
42%
9%
23%
21
flagthe Philippines
14%
41%
14%
26%
136
flagAustria
16%
35%
0%
45%
37
flagRepublic of Ireland
13%
34%
13%
37%
29
flagSingapore
11%
26%
11%
50%
42