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This is key to solving the problem since you'll know the source culprits to remove or to control with ventilation or with an effective chemical air purifier with gas-phase filter media (in cases where it's not feasible to totally remove the sources of off-gassing chemical pollutants)

The large-scale incineration of municipal and medical waste is the largest source of dioxins and furans in Canada

Below is a short checklist you can adapt for your next comparison

Collins, Glenn "For TV's Trixie, the Honeymoon Lives On", The New York Times

In 1961, researchers named Sarkay and his team closely examined parts of a skin condition called erythrasma