Temporal variations in surface ozone and its precursors and meteorological effects at an urban site in China

Tu, Jun; Xia, Zong-Guo; Wang, Hesheng; Li, Wenqing

doi:10.1016/j.atmosres.2007.02.003

Cited by 186 publications

(79 citation statements)

References 45 publications

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“…On diurnal basis (Fig. 3), O 3 showed a positive correlation with temperature, which is a measure of incident solar radiation and consequently the effectiveness of photochemistry (Sillman et al 1990;Walcek and Yuan 1995;Tu et al, 2007). Annual maximum and minimum temperatures recorded were 42°C on May 11, 2010 (15:00) and 13°C on December 22, 2010 (07:00), respectively.…”

Section: Meteorological Observationsmentioning

confidence: 99%

Environmental monitoring of surface ozone and other trace gases over different time scales: chemistry, transport and modeling

Venkanna

Nikhil

Rao

et al. 2014

Int. J. Environ. Sci. Technol.

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Increasing concentration of tropospheric ozone (O 3 ) is a serious air pollution problem faced commonly by the urban people. The present study emphasizes on variations of air pollutant concentrations viz., O 3 , nitrogen oxides (NO x ), carbon monoxide (CO), sulfur dioxide (SO 2 ) and black carbon (BC) at a tropical urban site located in the Deccan plateau region with semi-arid climate. The air monitoring site revealed typical diurnal/seasonal trends attributing to the complex chemistry of surface O 3 formation from its precursors. Role of SO 2 in the formation of free radical (HO Á 2 ) and its impact on O 3 concentration is distinguished part of the study. The results showed the highest mean O 3 in summer (57.5 ± 15.2 ppbv) followed by winter and monsoon. Observations of BC aerosols showed the highest mean value during winter (8.2 ± 2 lg m -3 ) and the lowest in monsoon (4.2 ± 1 lg m -3 ). Besides local influences, long-range transport of air masses were also studied by simulating back trajectories at different elevations during the study period. Furthermore, statistical analysis and modeling was performed with both linear (regression) and nonlinear (neural network) methods.

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Section: Meteorological Observationsmentioning

confidence: 99%

Environmental monitoring of surface ozone and other trace gases over different time scales: chemistry, transport and modeling

Venkanna

Nikhil

Rao

et al. 2014

Int. J. Environ. Sci. Technol.

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“…High solar radiation and air temperatures, low cloud cover giving clear sky conditions as well as a stable atmosphere are the main meteorological factors conducive to ozone formation in Hong Kong (Lee et al 2002) as in other parts of the world. Among the meteorological factors, solar radiation and air temperature have been found to correlate strongly with ozone concentrations on a day-today basis (Lin et al 2004;Tu et al 2007). Urban ozone concentrations are enhanced by increases in ambient temperature which accelerate the conversion rates in the atmospheric chemistry.…”

Section: Photochemical Pollution In Hong Kongmentioning

confidence: 99%

The emergence of urban ozone episodes in autumn and air temperature rise in Hong Kong

Lee

Wenig

Yang

2009

Air Qual Atmos Health

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“…Temperature can enhance the propagation of radical chain reactions, and has an opposite effect on the termination rate of these chains [47] [48]. Therefore, high temperatures facilitate ozone production.…”

Section: Variations In Ozone and Meteorological Parametersmentioning

confidence: 99%

Analysis of Ground Level Ozone and Nitrogen Oxides in the City of Dar es Salaam and the Rural Area of Bagamoyo, Tanzania

Hamdun¹,

Arakaki²

2015

OJAP

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From 2012 to 2015, we measured surface ozone, NOx, NO2, and NO levels at three urban sites (Mapipa, Ubungo, and Posta) and two suburban sites (Kunduchi and Vijibweni) in the city of Dar es Salaam and in the village of Mwetemo, a rural area of Bagamoyo, Tanzania. The average hourly O3 concentrations at all sites were between 9 ppb and 30 ppb during our sampling periods. O3 levels at suburban sites were generally higher than at urban sites. The average hourly concentrations in Dar es Salaam were 10 -32 ppb, while in Bagamoyo they were 9 -15 ppb. We observed a strong diurnal variation in Dar es Salaam while measurements from Bagamoyo showed little variation. At Dar es Salaam, the surface O3 concentrations increased from their minimum level at sunrise (around 6:00 a.m.) to a maximum in the late afternoon (around 4:00 p.m.), and then decreased toward 11:00 p.m. Another secondary ozone peak appeared between midnight and ~4:00 a.m., after which the surface ozone concentrations decreased to a minimum around 7:00 a.m. NO2 concentrations were higher at the urban sites of Ubungo and Posta, and their weekly average NO2 concentrations were 246 ppb and 118 ppb, respectively. Weekly average NOx concentrations ranged from 39.4 ppb at the Kunduchi site (suburban) to 738 ppb at the Ubungo site (urban). To our knowledge, there were few continuous measurements of ozone and nitrogen oxides concentrations in Tanzania. Since high NOx concentrations were observed, continuous air quality monitoring and effective air pollution control measures are required in Dar es Salaam to prevent further deterioration of air quality and limit the possible negative impacts on humans and vegetation.

show abstract

Temporal variations in surface ozone and its precursors and meteorological effects at an urban site in China

Cited by 186 publications

References 45 publications

Environmental monitoring of surface ozone and other trace gases over different time scales: chemistry, transport and modeling

Environmental monitoring of surface ozone and other trace gases over different time scales: chemistry, transport and modeling

The emergence of urban ozone episodes in autumn and air temperature rise in Hong Kong

Analysis of Ground Level Ozone and Nitrogen Oxides in the City of Dar es Salaam and the Rural Area of Bagamoyo, Tanzania

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