Indoor carbonyl compounds in an academic building in Beijing, China: concentrations and influencing factors

Abstract

Carbonyl compounds in indoor air are of great concern for their adverse health effects. Between February and May, 2009, concentrations of 13 carbonyl compounds were measured in an academic building in Beijing, China. Total concentration of the detected carbonyls ranged from 20.7 to 189.1 μg·m^-3, and among them acetone and formaldehyde were the most abundant, with mean concentrations of 26.4 and 22.6 μg·m^-3, respectively. Average indoor concentrations of other carbonyls were below 10 μg·m^-3. Principal component analysis identified a combined effect of common indoor carbonyl sources and ventilation on indoor carbonyl levels. Diurnal variations of the carbonyl compounds were investigated in one office room, and carbonyl concentrations tended to be lower in the daytime than at night, due to enhanced ventilation. Average concentrations of carbonyl compounds in the office room were generally higher in early May than in late February, indicating the influence of temperature. Carbonyl source emission rates from both the room and human occupants were estimated during two lectures, based on one-compartment mass balance model. The influence of human occupants on indoor carbonyl concentrations varies with environmental conditions, and may become significant in the case of a large human occupancy.

Keywords

carbonyl compounds / indoor air / ventilation / human occupancy / source emission rate (SER) / principal component analysis (PCA)

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Acknowledgements

This work was funded by the Special Fund of State Key Joint Laboratory of Environmental Simulation and Pollution Control of China (No. 08Y02ESPCT).

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