Suffocating gas

... combine with hemoglobin more than oxygen. This is the reason why this gas suffocates us! I searched a lot, but I couldn't found anything about the most suffocating gas after Carbon monoxide! Can anyone help? I'd appreciate it! & sorry for ...

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... toxic pollutants.....dang, all the algea and hydroweed in the lakes are suffocating our fish now do to global warming......and the atmospheric pressure ... today.....it is the jet fuels that are transported via pipes from the gas stations/ well , ususally, out the airports...... they (these morning ...

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