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Discussion papers
https://doi.org/10.5194/acp-2019-310
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-310
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 15 May 2019

Research article | 15 May 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Using wavelet transform to analyse on-road mobile measurements of air pollutants: a case study to evaluate vehicle emission control policies during the 2014 APEC summit

Yingruo Li1,2, Ziqiang Tan1, Chunxiang Ye1, Junxia Wang1, Yanwen Wang1, Yi Zhu1, Pengfei Liang1, Xi Chen1, Yanhua fang1, Yiqun Han1, Qi Wang1, Di He3, Yao Wang3, and Tong Zhu1 Yingruo Li et al.
  • 1BIC-ESAT and SKL-ESPC, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China
  • 2Institute of Urban Meteorology, China Meteorological Administration, Beijing, 100089, China
  • 3Environmental Meteorology Forecast Center of Beijing-Tianjin-Hebei, China Meteorological Administration, Beijing, 100089, China

Abstract. Vehicle emissions are a major source of air pollution in urban areas, and thus greatly impact air quality in the megacity Beijing. Various vehicle emission control policies have been implemented at great cost, but there is a lack of appropriate methods to evaluate the effectiveness of such policies. Here we developed a wavelet transform method (WTM) to evaluate the effectiveness of vehicle emission control policies during the 2014 Asia-Pacific Economic Cooperation (APEC) summit, taking advantage of high time resolution mobile measurements of NO, NOx, BC, CO, SO2, and O3 made around the 4th Ring Road of Beijing. The WTM decomposed on-road mobile measurements into low- and high- frequency components, where the former represents immediate vehicle emissions, and the latter represents the atmospheric background in addition to accumulated on-road emissions. The high-frequency component of the WTM (CH_freq.), which represents the concentrations of pollutants from vehicle emissions (Cveh.), was used to evaluate the changes in vehicle emission intensity in the full-APEC period (3–12 November 2014) relative to the pre-APEC (28 October to 2 November 2014) and post-APEC (13–22 November 2014) periods, during which different vehicle emission control policies were implemented. Our results suggest that the Cveh. of NO, NOx, BC, and CO in the full-APEC period were 19.4 %, 17.7 %, 0 %, and 50 % lower, respectively, than those in the pre-APEC period during daytime, and were 50 %, 47.3 %, 62.5 %, and 50 % lower than those in the post-APEC period during daytime. The Cveh. of NO, NOx, BC, and CO in the full-APEC period were 65.3 %, 65.4 %, 14.3 %, and 50 % lower than those in the post-APEC period during nighttime. These results indicate that the vehicle emission control policies implemented during the full-APEC period were effective. The WTM is a feasible and stable technique for signal decomposition of atmospheric measurements, and it is a useful method for the evaluation of pollution control policies.

Yingruo Li et al.
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Short summary
Vehicle emissions are a major source of Beijing. Various vehicle emission control policies have been implemented at great cost, but there is a lack of appropriate methods to evaluate the effectiveness of such policies. Here we developed a new method to evaluate the effectiveness of vehicle emission control policies during APEC. Our findings is instructive for air pollution control policies' making.
Vehicle emissions are a major source of Beijing. Various vehicle emission control policies have...
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