How can we monitor harmful offgassing and control those offgassings?

We know all materials have some sort of offgassing but are concerned about the harmful gasses in an enclosed home. Does the HVAC recirculation take care of the gas or does it just spread it around the house.
The dash board in our cars leaves a film on the inside windshield due to offgassing. What does it do to our lungs and DNA?

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