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A comment on Ask HN: Any HNers have air quality sensors near-ish 'East Palistine, Ohio'?. Parent comment

Re:Ask HN: Any HNers have air quality sensors near-ish 'East... by segmondy on Tuesday February 14, 2023 @07:28AM (#34788381)
The chemical from the train got burned which turned it into a different chemical. Are they only testing for purely what was in the train or the byproducts of the chemical being burned?
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Re:Ask HN: Any HNers have air quality sensors near-ish 'East... by Accujack on Wednesday February 15, 2023 @12:52AM (#34800573)
Both. The combustion products of any of the chemicals listed as being on the train so far are CO, CO2, HCl, and trace phosgene. Only VCM has the last two. The HCl is the biggest risk because it's the largest product by volume and because when inhaled it forms hydrochloric acid with water in the lungs. Fortunately it will combine with water in the atmosphere if it finds that first.
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