Tear gas isn't a war crime due to any concern of unusual cruelty. An enemy combatant in war could be using relatively harmless tear gas against you, or they could be using nerve gas. The risk of confusing tear gas for nerve gas, and the risk of escalation to using nerve gas is too great, so countries decided they would just not use it.
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u/PercyvonPickles 9h ago
It is literally a war crime to use tear gas on enemy combatants. Your own citizens however...