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2019;44:E35765

EPA researchers, working from a laboratory chamber filled with simulated wildfire smoke from smoldering pine needles, tested a range of portable air cleaners and measured their Clean Air Delivery Rate (CADR), a standardized metric for particle removal capacity

The formaldehyde results are consistent with three somewhat competitive influences on formaldehyde yields: i) the reduction in quantity of precursors such as sugars and cellulosic materials acting to reduce the formaldehyde emissions, ii) the reduction in sidestream ammonia yields inhibiting the energetically favourable reaction of ammonia with formaldehyde to form hexamethylenetetramine, thereby potentially boosting formaldehyde emissions, and iii) greater oxidative formation of formaldehyde as the circumference is reduced and surface area to internal volume increases

For healthcare practitioners in smoking cessation clinics, FTND scores required assessment at least every 3 months

Experience shows time and time again that forcefully curtailing popular products always backfires, leading to illicit use and lawbreaking