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It is well known that when some VOCs are combined, secondary pollutants such as formaldehyde (a known nose, throat, and lung irritant) may be produced

Their selective removal by filters containing activated charcoal granules

Measurement gear: two calibrated PurpleAir sensors placed 3 ft

Although its great for tobacco smoke, its industrial-grade sorbent media filters mean that it can also be used in working environments to protect against toxic fumes and carcinogens

To revive stale smoke, place a bread slice inside a plastic container to revive its aroma and flavour

That said, we did not test for performance in cold weather