Analyses of the Ozone Weekend Effect in Tokyo, Japan: Regime of Oxidant (O3 + NO2) Production

Sadanaga, Yasuhiro; Sengen, Mitsuyo; Takenaka, Norimichi; Bandow, Hiroshi

doi:10.4209/aaqr.2011.07.0102

Cited by 45 publications

(24 citation statements)

References 20 publications

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“…On the 11th of May, O 3 steeply declined after 19:00 h with a reduction rate of 14 ppbv/h compared to the control day (8 ppbv/h). It was reported that the reduction in O 3 occurs in the presence of a high concentration of NO x specifically in the urban lower tropospheric region (Debaje and Kakade 2006;Sadanaga et al 2012). In addition to this, reduced VOC/NO x ratios can also cause reduction of O 3 by titration reaction due to high emission of NO (Swamy et al 2012) resulting to the formation of NO 2 and O 2 .…”

Section: Variations In Surface O 3 and No X During Thunderstorms In Tmentioning

confidence: 98%

Role of lightning phenomenon over surface O3 and NOx at a semi-arid tropical site Hyderabad, India: inter-comparison with satellite retrievals

Venkanna

Nikhil

Sinha

et al. 2015

Theor Appl Climatol

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The influence of lightning over surface-level trace gases was examined for pre-monsoon and monsoon seasons in the year 2012. Lightning events were measured using ground-based electric field monitor (EFM) and space-based lightning imaging sensor (LIS). The results showed that lightning frequency was higher during pre-monsoon period compared to monsoon, which is in good agreement with the satellite retrievals. The increase in concentration of NO x on lightning event led to a subsequent decrease in surface O 3 due to the titration reaction. Source apportionment study of SO 2 /NO x (S/N) and CO/NO x (C/N) ratios and poor correlation of NO x vs CO and NO x vs SO 2 on the lightning day confirmed the emission of NO x from dissimilar sources.

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Section: Variations In Surface O 3 and No X During Thunderstorms In Tmentioning

confidence: 98%

Role of lightning phenomenon over surface O3 and NOx at a semi-arid tropical site Hyderabad, India: inter-comparison with satellite retrievals

Venkanna

Nikhil

Sinha

et al. 2015

Theor Appl Climatol

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“…This is relatively easy to identify, so received comment in Victorian cities where pollution was argued to derive from cooking Sunday roast dinners (Brimblecombe, 1987). Today, pollutants such as CO, NOx, NO2, SO2 and PM2.5,10 are typically found to be higher on weekdays, because of rush hour traffic, work patterns and industrial activities, but also influenced by population and urbanization (Qin et al, 2004;Riga Karandinos, 2005;Pudasainee et al, 2010;Sadanaga et al, 2012;Wolf et al, 2013;Cerro et al, 2014;Porter et al, 2014;Henschel et al, 2015;Malik et al, 2015;Martins et al, 2015). Ozone as a secondary photochemical oxidant, shows more complex behavior: lower on weekdays than on weekends (Tang et al, 2008), although sometimes it can also be higher during the week (Huryn et al, 2014;Xie et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Effect of Fireworks, Chinese New Year and the COVID-19 Lockdown on Air Pollution and Public Attitudes

Brimblecombe

Lai

2020

Aerosol Air Qual. Res.

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Concentrations of primary air pollutants are driven by emissions and weather patterns, which control their production and dispersion. The early months of the year see the celebratory use of fireworks, a week-long public holiday in China, but in 2020 overlapped in Hubei Province with lockdowns, some of > 70 days duration. The urban lockdowns enforced to mitigate the COVID-19 pandemic give a chance to explore the effect of rapid changes in societal activities on air pollution, with a public willing to leave views on social media and show a continuing concern about the return of pollution problems after COVID-19 restrictions are lifted. Fireworks typically give rise to sharp peaks in PM2.5 concentrations, though the magnitude of these peaks in both Wuhan and Beijing has decreased under tighter regulation in recent years, along with general reductions in pollutant emissions. Firework smoke is now most evident in smaller outlying cities and towns. The holiday effect, a reduction in pollutant concentrations when normal work activities are curtailed, is only apparent for NO2 in the holiday week in Wuhan (2015-2020), but not Beijing. Lockdown in Wuhan was characterised by decreases in NO2, along with more subtle changes in particulate matter and other pollutants. Ozone noticeably increases as there is less NO available for titration, but such change may not be widespread geographically. Beijing, where restrictions were less stringent, showed some improvement in air quality, though this is more difficult to detect, even within the 5 th Ring Road.

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“…OH + NO 2 + M → HNO 3 + M. (11) Hence the relationship between ozone formation and precursor concentrations is non-linear and complex. An example of the complexity is the ozone production regime, which consists of "NO x -limited" and "VOC-limited" (or NO x -saturated) regimes.…”

Section: Introductionmentioning

confidence: 99%

New System for Measuring the Photochemical Ozone Production Rate in the Atmosphere

Sadanaga

Kawasaki

Tanaka

et al. 2017

Environ. Sci. Technol.

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We have developed a new system for measuring photochemical ozone production rates in the atmosphere. Specifically, the system measures the net photochemical oxidant (O: the sum of ozone (O) and nitrogen dioxide (NO)) production rates (P-L(O)). Measuring O avoids issues from perturbations to the photostationary states between nitrogen oxides (NO) and O. This system has "reaction" and "reference" chambers. Ambient air is introduced into both chambers, and O is photochemically produced in the reaction chamber and not generated in the reference chamber. Air from the chambers is alternately introduced into an NO-reaction (NO: nitric oxide) tube to convert O to NO, and then the O concentration is measured as NO using a laser-induced fluorescence technique. P-L(O) was obtained by dividing the difference in O concentrations between air samples from the two chambers by the mean residence time of the air in the reaction chamber. In this study, the P-L(O) measurement system was characterized, and the current detection limit of P-L(O) was determined to be 0.54 ppbv h with an integration time of 60 s (S/N = 2), assuming an ambient O concentration of 100 ppbv. Field measurements of P-L(O) were conducted using the system at a remote forest location.

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Analyses of the Ozone Weekend Effect in Tokyo, Japan: Regime of Oxidant (O3 + NO2) Production

Cited by 45 publications

References 20 publications

Role of lightning phenomenon over surface O3 and NOx at a semi-arid tropical site Hyderabad, India: inter-comparison with satellite retrievals

Role of lightning phenomenon over surface O3 and NOx at a semi-arid tropical site Hyderabad, India: inter-comparison with satellite retrievals

Effect of Fireworks, Chinese New Year and the COVID-19 Lockdown on Air Pollution and Public Attitudes

New System for Measuring the Photochemical Ozone Production Rate in the Atmosphere

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