Relationships of surface ozone with its precursors, particulate matter and meteorology over Delhi

Sharma, Ashima; Mandal, T. K.; Sharma, S.K.; Shukla, Devesh Kumar; Singh, Sachchidanand

doi:10.1007/s10874-016-9351-7

Cited by 48 publications

(12 citation statements)

References 102 publications

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“…At the coastal site of Trivandrum, the broad daytime peak of ozone may be attributed to the strong influence of sea and land breeze. At the urban site of Delhi, although monthly average ozone was lower, NO x levels were very high as compared to the present site (Sharma et al 2016). Similar variation was observed at the urban sites of Lucknow and Varanasi where monthly average O 3 concentrations were lower than the present site, however, at Lucknow NO x levels were comparatively high and at Varanasi, they were comparable to the present site (Shukla et al 2017).…”

Section: Seasonal Variation Of O 3 and Nosupporting

confidence: 74%

“…High water content in air may lead to the removal of nitrogen oxides from air to form nitric and nitrous acid because of their high water solubility (Seinfeld and Pandis 2006). Earlier studies have also reported a decrease in O 3 , NO, NO 2 and NO x levels due to rainfall (Reddy et al 2012;Bhuyan et al 2014;Sharma et al 2016). In addition, during monsoon season the wind direction was predominantly from Arabian Sea in south-west direction; therefore, these air-masses were comparatively clean in nature.…”

Section: Diurnal Variation Of Ozone and Its Precursorsmentioning

confidence: 86%

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Characteristics of surface ozone in Agra, a sub-urban site in Indo-Gangetic Plain

et al. 2018

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In the present study, measurements of surface ozone (O 3) and its precursors (NO and NO 2) were carried out at a suburban site of Agra (27 • 10 N, 78 • 05 E), India during May 2012-May 2013. During the study period, average concentrations of O 3 , NO, and NO 2 were 39.6 ± 25.3, 0.8 ± 0.8 and 9.1 ± 6.6 ppb, respectively. O 3 showed distinct seasonal variation in peak value of diurnal variation: summer > postmonsoon > winter > monsoon. However, NO 2 showed highest levels in winter and lowest in monsoon. The average positive rate of change of O 3 (08:00-11:00 hr) was highest in April (16.3 ppb/hr) and lowest in August (1.1 ppb/hr), while average negative rate of change of O 3 (17:00-19:00 hr) was highest in December (-13.2 ppb/hr) and lowest in July (-1.1 ppb/hr). An attempt was made to identify the VOC-NO x sensitivity of the site using O 3 /HNO 3 ratio as photochemical indicator. Most of the days this ratio was above the threshold value (12-16), which suggests NO x sensitivity of the site. The episodic event of ozone was characterized through meteorological parameters and precursors concentration. Fine particles (PM 2.5) cause loss of ozone through heterogeneous reactions on their surface and reduction in solar radiation. In the study, statistical analyses were used to estimate the amount of ozone loss.

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Section: Seasonal Variation Of O 3 and Nosupporting

confidence: 74%

Section: Diurnal Variation Of Ozone and Its Precursorsmentioning

confidence: 86%

Characteristics of surface ozone in Agra, a sub-urban site in Indo-Gangetic Plain

et al. 2018

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“…The daytime average ozone levels and rate of change in ozone were higher in May and November as compared to the rest of the year, as shown in table 1. The daily O 3max /O 3min ratio in the pollution index, for polluted sites, has values in excess of 10 while those lower than 1.40 for clean areas (Sharma et al 2016). The index value of the order of 15.60 indicates that the study location has remarkable ozone pollution.…”

Section: Resultsmentioning

confidence: 87%

“…The increase in the PM 2.5 /PM 10 ratio corresponds to the decrease in the monthly averaged ozone levels as shown in figure 4. The possible effect of fine PM on the photochemical oxidant cycle eventually acts as a filter for ozone (Jacob 2000;Sharma et al 2016).…”

Section: Resultsmentioning

confidence: 99%

The impact of crop residue burning (CRB) on the diurnal and seasonal variability of the ozone and PM levels at a semi-urban site in the north-western Indo-Gangetic plain

et al. 2019

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Ozone and particulate matter (PM), PM 10 and PM 2.5 , were monitored along with meteorological parameters at a semi-urban location, Patiala, in the northwestern Indo-Gangetic plain from December 2013 to November 2014. The annual mean concentration levels of PM 10 , PM 2.5 and ozone were recorded as 178 μg m −3 , 88 μg m −3 and 39 ppb, which also exceeded the national standards on a 24-h average basis, by 77.3% (335 days), 53.2% (338 days) and 20 days, respectively. High levels of PM (PM 10 and PM 2.5) were observed in winter (58-381 and 42-270 μg m −3) and in the post-monsoon (71-320 and 39-320 μg m −3) season and a rise in the level of ozone was observed in summer (22-72 ppb) and in the post-monsoon season (23-73 ppb), respectively. The rate of ozone production was the highest during the post-harvest fire period (3.94 ppb O 3 /h in May and 4.23 ppb O 3 /h in November). A Pearson correlation study showed the strong dependency of PM and ozone on meteorological variables. Relative humidity has the highest ranking for ozone and PM 10 , while wind speed has the lowest rank for ozone, PM 10 and PM 2.5 in the order of factors affecting the level of pollutants. The generalised linear model and the neural network model (for ozone) and the random forest model (for PM) outperformed on the basis of performance indices and further cross-validation was done.

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“…Gu et al used the NO 2 columns observed from OMI and the Community Multiscale Air Quality (CMAQ) model to derive the ground-level NO 2 concentrations in China [15]. Sharma et al presented the temporal variations of surface NO x during 2012 to 2014 at an urban site of Delhi, India [16]. Varotsos et al found a progressive increase of mean values of NO 2 /NO x versus NO x when the level of NO x increases in Athens, Greece [17].…”

Section: Introductionmentioning

confidence: 99%

Spatial Distribution and Temporal Trend of Tropospheric NO₂ over the Wanjiang City Belt of China

Xie

Wang

2018

Advances in Meteorology

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We utilize the tropospheric NO2 columns derived from the observations of Ozone Monitoring Instrument (OMI) onboard AURA to analyze the spatial distributions and temporal trends of NO2 in Wanjiang City Belt (WCB) of China from 2005 to 2016. The aim of this study is to assess the effect of industrial transfer policy on the air quality in WCB. Firstly, we used the surface in situ NO2 concentrations to compare with the OMI-retrieved tropospheric NO2 columns in order to verify the accuracy of the satellite data over the WCB area. Although it is difficult to compare the two datasets directly, the comparison results prove the accuracy of the OMI-retrieved tropospheric NO2 columns in cities of WCB. Then, the spatial distributions of the annual averaged tropospheric NO2 total columns over Anhui Province show that NO2 columns were considerably higher in WCB than those in other areas of Anhui. Also, we compared the spatial distributions of the total NO2 columns in 2005 through 2010 and in 2011 through 2016 and found that the total NO2 columns in WCB increased by 19.9%, while the corresponding value increased only 13.9% in other Anhui areas except the WCB area. Furthermore, the temporal variations of NO2 columns show that although the NO2 columns over WCB and Anhui increased significantly from 2005 to 2011, they decreased sharply from 2011 to 2016 due to the strict emission reduction measures in China. Finally, the HYSPLIT model was used to analyze the origins of NO2 and transport pathways of air masses in a typical city, Ma’anshan city.

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Relationships of surface ozone with its precursors, particulate matter and meteorology over Delhi

Cited by 48 publications

References 102 publications

Characteristics of surface ozone in Agra, a sub-urban site in Indo-Gangetic Plain

Characteristics of surface ozone in Agra, a sub-urban site in Indo-Gangetic Plain

The impact of crop residue burning (CRB) on the diurnal and seasonal variability of the ozone and PM levels at a semi-urban site in the north-western Indo-Gangetic plain

Spatial Distribution and Temporal Trend of Tropospheric NO₂ over the Wanjiang City Belt of China

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Relationships of surface ozone with its precursors, particulate matter and meteorology over Delhi

Cited by 48 publications

References 102 publications

Characteristics of surface ozone in Agra, a sub-urban site in Indo-Gangetic Plain

Characteristics of surface ozone in Agra, a sub-urban site in Indo-Gangetic Plain

The impact of crop residue burning (CRB) on the diurnal and seasonal variability of the ozone and PM levels at a semi-urban site in the north-western Indo-Gangetic plain

Spatial Distribution and Temporal Trend of Tropospheric NO2 over the Wanjiang City Belt of China

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Spatial Distribution and Temporal Trend of Tropospheric NO₂ over the Wanjiang City Belt of China