A practical approach to estimate emission rates of indoor air pollutants due to the use of personal combustible products based on small-chamber studies.
As emission rates of airborne pollutants are commonly measured from combusting substances placed inside small chambers, those values need to be re-evaluated for the possible significance under practical conditions. Here, a simple numerical procedure is investigated to extrapolate the chamber-based emission rates of formaldehyde that can be released from various combustible sources including e-cigarettes, conventional cigarettes, or scented candles to their concentration levels in a small room with relatively poor ventilation. This simple procedure relies on a mass balance approach by considering the masses of pollutants emitted from source and lost through ventilation under the assumption that mixing occurs instantaneously in the room without chemical reactions or surface sorption. The results of our study provide valuable insights into re-evaluation procedure of chamber data to allow comparison between extrapolated and recommended values to judge the safe use of various combustible products in confined spaces. If two scented candles with a formaldehyde emission rate of 310 µg h(-1) each were lit for 4 h in a small 20 m(3) room with an air change rate of 0.5 h(-1), then the 4-h (candle lit) and 8-h (up to 8 h after candle lighting) TWA [FA] were determined to be 28.5 and 23.5 ppb, respectively. This is clearly above the 8-h NIOSH recommended exposure limit (REL) time weighted average of 16 ppb.
Atmospheric Environment & Air Quality Management Lab, Department of Civil & Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, Seoul 133-791, Republic of Korea.
Jan E
JE
Szulejko
Atmospheric Environment & Air Quality Management Lab, Department of Civil & Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, Seoul 133-791, Republic of Korea. Electronic address: kkim61@hanyang.ac.kr.
Ki-Hyun
KH
Kim
D000393:Air Pollutants / Q000032:analysis*; D016902:Air Pollution, Indoor / Q000032:analysis*; D066300:Electronic Nicotine Delivery Systems; D004784:Environmental Monitoring / Q000379:methods*; D005557:Formaldehyde / Q000032:analysis*; D008962:Models, Theoretical; D062789:Tobacco Products
D000393:Air Pollutants; D005557:Formaldehyde
Chamber; Emission rates; Extrapolation; Formaldehyde; Hazards; Room