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| German | English |
| CO₂-Konzentration | CO₂ concentration (in the soil air) |
| CO₂-Konzentration | carbon dioxide content (in the soil air) |
| CO-Konzentration | CO concentration |
| CO-Konzentration | carbon monoxide concentration |
| CO₂-Konzentration | carbon dioxide concentration |
| hochstzulässige Konzentration | maximum permitted concentration, MAC |
| hochstzulässige Konzentration | maximum allowable concentration |
| maximal zulässige Konzentration | maximum permitted concentration, MAC |
| mittlere latente Konzentration | average latent concentration, ALC₅₀ (half of test animals will die during a certain duration) |