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
10%
70%
5%
15%
20
flagthe Netherlands
0%
57%
3%
38%
26
flagGermany
13%
56%
1%
29%
96
flagIndonesia
3%
55%
11%
29%
27
flagIndia
13%
54%
13%
16%
992
flagPakistan
8%
54%
12%
21%
134
flagUnknown
6%
54%
11%
27%
87
flagNigeria
10%
52%
26%
10%
38
flagGreece
0%
52%
11%
35%
17
flagPoland
10%
51%
3%
33%
26813
flagMalaysia
12%
50%
17%
19%
57
flagthe United Kingdom
11%
48%
9%
29%
415
flagthe United States
13%
46%
7%
30%
1347
flagCanada
14%
46%
9%
28%
82
flagthe United Arab Emirates
10%
46%
17%
25%
28
flagthe Philippines
15%
42%
14%
24%
128
flagAustralia
17%
42%
10%
26%
84
flagGhana
16%
38%
11%
27%
18
flagRepublic of Ireland
14%
33%
14%
37%
27
flagSingapore
12%
25%
10%
51%
39