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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nitrogen
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flagFinland
1%
96%
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2%
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flagSwitzerland
1%
87%
0%
11%
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flagthe United Arab Emirates
3%
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flagItaly
3%
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2%
19%
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flagthe Netherlands
5%
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1%
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flagAustria
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flagGermany
3%
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25%
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flagNorway
7%
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19%
71
flagFrance
3%
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109
flagPoland
7%
64%
3%
23%
36693
flagthe United Kingdom
7%
64%
4%
22%
1215
flagRepublic of Ireland
5%
62%
4%
27%
170
flagSweden
4%
62%
6%
27%
95
flagIndia
12%
61%
10%
14%
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flagPakistan
6%
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12%
19%
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flagthe United States
11%
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6%
24%
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flagCanada
10%
53%
6%
26%
115
flagthe Philippines
11%
51%
10%
22%
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flagUnknown
10%
49%
5%
35%
1709
flagAustralia
11%
48%
7%
27%
96