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Their vaccine is made by inactivating influenza viruses with a carcinogenic chemical called beta-propiolactone.

Most forms of selenium are not considered carcinogenic; the EPA, however, has determined that one form, selenium sulfide, is a probable carcinogen.

Analysts also probe for asbestos — a job that expanded as the carcinogenic material turned up in many more locations than expected.

The Honoring Our Fallen Heroes Act is considered crucial by its supporters, with climate change fueling an increase in wildfire frequency and firefighting deemed carcinogenic by the World Health Organization.

The blazes incinerated plastics, metals, electronic components and building materials — including older, no-longer-permitted ones, such as asbestos, which is carcinogenic.