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
flagNew Zealand
5%
73%
5%
15%
19
flagGermany
9%
58%
1%
31%
74
flagthe Netherlands
0%
56%
4%
40%
25
flagGreece
0%
56%
12%
31%
16
flagIndonesia
3%
55%
11%
29%
27
flagIndia
13%
54%
13%
16%
965
flagPakistan
9%
54%
13%
20%
129
flagUnknown
6%
54%
11%
27%
87
flagNigeria
11%
52%
25%
11%
36
flagPoland
10%
51%
3%
33%
26281
flagMalaysia
12%
50%
17%
19%
56
flagthe United Kingdom
10%
48%
8%
29%
397
flagthe United States
13%
47%
7%
30%
1320
flagCanada
15%
46%
8%
28%
80
flagthe United Arab Emirates
10%
46%
17%
25%
28
flagAustralia
18%
43%
10%
25%
83
flagthe Philippines
15%
42%
14%
24%
128
flagGhana
16%
38%
11%
27%
18
flagRepublic of Ireland
12%
37%
16%
33%
24
flagSingapore
13%
26%
10%
50%
38