Surface ozone scenario and air quality in the north-central part of India

Saini, Rajkumar; Taneja, Ajay; Singh, P. K.

doi:10.1016/j.jes.2017.02.008

Cited by 19 publications

(9 citation statements)

References 15 publications

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“…The present study area is urban part and thus falls under VOC-limited region of the country (Seinfeld and Pandis 1998 ). In a VOC-limited environment, the ozone accumulation is directed by the chemistry between the anthropogenic emission of NOx and ozone, beside the meteorological factors (Saini et al 2017 ). Thus, the increase in concentration of ozone during lockdown period could be correlated to increased solar radiation and decrease NO 2 owing to favorability of the photochemical reaction (Fig.…”

Section: Resultsmentioning

confidence: 99%

Epigrammatic study on the effect of lockdown amid Covid-19 pandemic on air quality of most polluted cities of Rajasthan (India)

Sharma

Jain

Lamba

2020

Air Qual Atmos Health

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Covid-19 pandemic has adversely affected all the aspects of life in adverse manner; however, a significant improvement has been observed in the air quality, due to restricted human activities amidst lockdown. Present study reports a comparison of air quality between the lockdown duration and before the lockdown duration in seven selected cities (Ajmer, Alwar, Bhiwadi, Jaipur, Jodhpur, Kota, and Udaipur) of Rajasthan (India). The period of analysis is 10 March 2020 to 20 March 2020 (before lockdown period) versus 25 March to 17 May 2020 (during lockdown period divided into three phases). In order to understand the variations in the level of pollutant accumulation amid the lockdown period, a trend analysis is performed for 24 h daily average data for five pollutants (PM 2.5 , PM 10 , NO 2 , SO 2 , and ozone). Fig. a Graphical abstract

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Section: Resultsmentioning

confidence: 99%

Epigrammatic study on the effect of lockdown amid Covid-19 pandemic on air quality of most polluted cities of Rajasthan (India)

Sharma

Jain

Lamba

2020

Air Qual Atmos Health

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“…The contrasting trend of O 3 may be due to more favorable conditions for photochemical reactions attributed to increased solar insolation and a decrease in NO 2 leading to changes in the photochemical reactions determining ozone formation and destruction (Sharma et al, 2016;Dang and Liao, 2019;Xu et al, 2020). The underlying chemistry between anthropogenic emissions like NO x in a VOC-limited environment and O 3 along with the meteorological parameters govern the accumulation of surface ozone in the atmosphere (Gorai et al, 2015;Saini et al, 2017). Similar increasing trends have been observed in the levels of O 3 concentrations during the lockdown period in China by Xu et al (2020).…”

Section: City Before Vs During Lockdown' 2020mentioning

confidence: 99%

Social and Travel Lockdown Impact Considering Coronavirus Disease (COVID-19) on Air Quality in Megacities of India: Present Benefits, Future Challenges and Way Forward

Jain

Sharma

2020

Aerosol Air Qual. Res.

227

230

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The coronavirus disease (COVID-19) created enormous pressure across the globe due to an increasing number of COVID-19 infected cases. All the governments' primary focus is to save humanity from this pandemic problem, and they have lockdown almost the entire nation to stop the spread of infection. This lockdown resulted in a considerable impact on the global as well as a local economy that will take a long time to perform with business as usual scenario. However, improvement in the air quality of the cities across the globe has emerged as a key benefit of this lockdown. Therefore, this study aims to assess the overall impact of social and travel lockdown in five megacities of India; Delhi, Mumbai, Chennai, Kolkata, and Bangalore. The study evaluated the spatiotemporal variations in five criteria pollutants over two time periods, i.e.

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“…The two main causes of O 3 showing up on the Earth's surface are the photochemical reactions of precursor gases (Carbon Monoxide, Methane, Non-Methane Hydro Carbons and Volatile Organic Compounds) in the presence of Nitrogen Oxide (NOx) and the inflow from the stratosphere. The amount of precursor gases emitted by human activities from rural and urban areas have a significant effect on O 3 variations [8][9][10]. Moreover, O 3 also acts as an active greenhouse gas by which it can modulate climate change through a positive radiative forcing [11].…”

Section: Introductionmentioning

confidence: 99%

Long-Term Variations of Air Quality Influenced by Surface Ozone in a Coastal Site in India: Association with Synoptic Meteorological Conditions with Model Simulations

Resmi¹,

Nishanth

Kumar³

et al. 2020

Atmosphere

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Atmospheric ozone (O3) in the surface level plays a central role in determining air quality and atmospheric oxidizing capacity. In this paper, we review our comprehensive results of simultaneous measurements of surface ozone (O3) and its precursor gas (NOx) and weather parameters that were carried out continuously for a span of six years (January 2013–December 2018) at a typical rural coastal site, Kannur (11.9° N, 75.4° E) in South India. Surface O3 concentration reached its maximum during daytime hours and minimum during the night time. The influence of solar radiation and water content on variations of O3 are discussed. A Multi-Layer Perceptron (MLP) artificial neural network technique has been used to understand the effect of atmospheric temperature on the increase in O3 over the past six years. This has been found that temperature has been a major contributor to the increase in O3 levels over the years. The National Centre for Atmospheric Research- Master Mechanism (NCAR-MM) Photochemical box model study was conducted to validate the variations of O3 in different seasons and years, and the results were shown to be in good agreement with observed trends.

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Surface ozone scenario and air quality in the north-central part of India

Cited by 19 publications

References 15 publications

Epigrammatic study on the effect of lockdown amid Covid-19 pandemic on air quality of most polluted cities of Rajasthan (India)

Epigrammatic study on the effect of lockdown amid Covid-19 pandemic on air quality of most polluted cities of Rajasthan (India)

Social and Travel Lockdown Impact Considering Coronavirus Disease (COVID-19) on Air Quality in Megacities of India: Present Benefits, Future Challenges and Way Forward

Long-Term Variations of Air Quality Influenced by Surface Ozone in a Coastal Site in India: Association with Synoptic Meteorological Conditions with Model Simulations

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