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Pollution Characteristic of Atmospheric Carbonyls during One Haze Event in Nanning, South China

Category: Aerosol and Atmospheric Chemistry

Volume: 16 | Issue: 5 | Pages: 1143-1151
DOI: 10.4209/aaqr.2015.01.0047
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Song-Jun Guo 1, Mei Chen2

  • 1 School of the Environment, Guangxi University, Nanning, China
  • 2 School of the Machine and Security, Nanning College, Nanning, China

Highlights

This is the first time study ambient carbonyls in haze in Nanning.
The abundant carbonyls were formaldehyde, acetaldehyde and acetone.
Haze exhibited the higher pollution of carbonyls than that in normal days.
Correlations of carbonyls were good in haze and excellent in normal days.
Ambient carbonyls in haze days might be related to the local traffic emissions.


Abstract

This study was the first to investigate pollution characteristics of atmospheric carbonyls in one haze event (July 17–22, 2012) in Nanning, south China. It was found that (1) acetaldehyde (29.74 ± 6.06 µg m–3), formaldehyde (11.20 ± 1.72 µg m–3), and acetone (9.18 ± 11.22 µg m–3) were the most abundant in haze days, (2) concentrations and O3 formation potentials of ambient carbonyls in haze days were significantly higher than those on normal days, and (3) visibility and wind speed in haze days were lower than those on normal days, indicating that haze days represented favorable pollution conditions for carbonyls. Diurnal variations of ambient carbonyls in haze days showed a pattern of two peaks occurring in two traffic rush-hour periods due to positive traffic emissions. Average concentration ratio of formaldehyde/acetaldehyde (C1/C2) in haze days (0.39 ± 0.10) was slightly lower than that (0.87 ± 0.23) on normal days, and the ratios in two traffic rush-hour periods were close to those in non rush-hour periods, likely implying that traffic emissions might not be a major source for ambient carbonyls. Correlation among formaldehyde, acetaldehyde, acetone, and total carbonyls was good (R2 = 0.49–0.85) in haze days and excellent (R2 = 0.80–0.98) on normal days, indicating that the sources of ambient carbonyls in haze days were more complex compared to normal days.

Keywords

Pollution characteristic Haze event Carbonyls Nanning


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