OPEN ACCESS

Articles online

High Nighttime Ground-Level Ozone Concentrations in Kemaman: NO and NO2 Concentrations Attributions

Category: Urban Air Quality

Volume: 15 | Issue: 4 | Pages: 1357-1366
DOI: 10.4209/aaqr.2015.01.0031
PDF | Supplemental material

Export Citation:  RIS | BibTeX

To cite this article:
Awang, N.R., Ramli, N.A., Yahaya, A.S. and Elbayoumi, M. (2015). High Nighttime Ground-Level Ozone Concentrations in Kemaman: NO and NO2 Concentrations Attributions. Aerosol Air Qual. Res. 15: 1357-1366. doi: 10.4209/aaqr.2015.01.0031.

Norrimi Rosaida Awang, Nor Azam Ramli, Ahmad Shukri Yahaya, Maher Elbayoumi

  • Clean Air Research Group, School of Civil Engineering, Engineering Campus, Universiti Sains Malaysia, 14300 Nibong Tebal, Penang, Malaysia

Highlights

The occurrences of high nighttime O3 in Malaysia as Tropical country is analysed.
HACA, is used to assess the sources of atmospheric pollutants at nine stations.
The stations has been categorized into three different clusters base on locations.
Lower concentration of NO 1.1 ppb reduced NO titration reactions during nighttime.
Nighttime NO2 might contribute to high nighttime O3.


Abstract

High nighttime ozone (O3) concentration levels were observed in Kemaman, Terengganu, and results were compared with those in other places in Malaysia. In this study, the contribution of precursors [nitric oxide (NO) and nitrogen dioxide (NO2)] and meteorological factors wind speed, and wind direction) toward long-term high nighttime O3 over the period of 1999 to 2010 was evaluated. During this period, the recorded highest nighttime O3 ground level was 89 ppb with more than 25% surpassing 20 ppb. Analysis shows that minimal decreasing trends were measured in Kemaman. Lower nitrogen oxide (NOx) concentrations restricted the sinking agents; thus, reducing the depletion rates allowed O3 to remain in the atmosphere. Minimal associations were observed between the O3 concentration level and the speed and direction of wind. Accordingly, the largest contributor toward high nighttime O3 ground level concentration in Kemaman was most probably NOx concentration.

Keywords

Long-term variations NOx concentration Nighttime ozone chemistry


Related Article

Particle Mass Concentrations and Number Size Distributions in 40 Homes in Germany: Indoor-to-outdoor Relationships, Diurnal and Seasonal Variation

Jiangyue Zhao, Wolfram Birmili, Birgit Wehner, Anja Daniels, Kay Weinhold, Lina Wang, Maik Merkel, Simonas Kecorius, Thomas Tuch, Ulrich Franck, Tareq Hussein, Alfred Wiedensohler

A Comparison Study of Indoor and Outdoor Air Quality in Nanjing, China

Ruochong Xu, Ximeng Qi , Guoqing Dai, Haoxian Lin, Jiachun Shi, Chengxu Tong, Peng Zhai, Caijun Zhu, Lei Wang, Aijun Ding
Accepted Manuscripts
DOI: 10.4209/aaqr.2019.10.0496
PDF
;