Also the problem of expired tear gas, which will "breaks down into cyanide oxide, phosgenes and nitrogens that are extremely dangerous" according to a 2017 study.
In particular Israel uses vast amounts of tear gas against Palestinians. I think if anywhere we will see the deleterious effects on human health and the environment there first.
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[ 3.4 ms ] story [ 23.0 ms ] threadhttps://twitter.com/wailly/status/1165183278011142145
This is how HK police uses Hongkongers for human experiments: https://www.hongkongfp.com/2019/08/09/hong-kong-reporters-co...