Gaseous pollutants over different sites in a metropolitan region (Pune) over India

Anand, Vrinda; Panicker, A. S.; Beig, Gufran

doi:10.1007/s42452-020-2472-2

Cited by 7 publications

(10 citation statements)

References 23 publications

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“…The averaged value of all these stations for a particular city has been used in this work. The US-EPA approved online analysers are used to monitor O 3 , CO, NO x (NO+NO 2 ), and VOC concentrations continuously, every 5 min (Anand et al 2020 ). The ground-level ozone was measured by the ozone analyser O342 (Environment SA, France) through the UV light absorption method, in which the amount of UV light absorbed is proportional to the amount of ozone present in the air, with a measurement range of 0–10 ppm and accuracy of < ± 2%.…”

Section: Methodsmentioning

confidence: 99%

Disparity in ozone trends under COVID-19 lockdown in a closely located coastal and hillocky metropolis of India

Korhale

Anand

Beig

2020

Air Qual Atmos Health

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The outbreak of COVID-19, a global health challenge faced by countries worldwide, led to a lockdown in India, thereby bringing down the emissions of various air pollutants. Here, we discuss the behaviour of surface ozone (O 3 ) concentrations and its precursors, oxides of nitrogen (NO x ), carbon monoxide (CO), and volatile organic compounds (VOC) at two Indian megacities namely Mumbai and Pune, closely located yet vastly differing in meteorology due to their locations. Although levels of CO, NO 2 , and VOC declined sharply after the lockdown in both cities, with NO 2 showing the highest reduction, ozone concentration in Pune remained unaffected, whereas Mumbai exhibited a mixed trend, touching even a maximum in between the lockdown. On a diurnal scale, the magnitude of O 3 levels during the lockdown period is higher at almost all hours in Mumbai, and in Pune, it is almost identical except during night hours when it is marginally higher in the lockdown period as compared to the normal period. On a whole, the pollution levels were brought down significantly which can be used as a benchmark in the future for the implementation of policies related to air quality management and emission control in Indian megacities by the policymakers. These results also can pave a way for the scientific community for local air quality modelling.

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Section: Methodsmentioning

confidence: 99%

Disparity in ozone trends under COVID-19 lockdown in a closely located coastal and hillocky metropolis of India

Korhale

Anand

Beig

2020

Air Qual Atmos Health

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“…The lower detection limit of the species is about 0.4–0.5 ppbv. Additional details of working methods are reported elsewhere ( Beig et al, 2013 ; Anand et al, 2020 ; Yadav et al, 2014 ). The meteorological parameters were at the same time measured using Automatic Weather Station co-located alongside air quality monitoring stations whose details are provided elsewhere ( Anand et al, 2019 ) and hence not discussed here in detail.…”

Section: Methodsmentioning

confidence: 99%

COVID-19 and environmental -weather markers: Unfolding baseline levels and veracity of linkages in tropical India

Beig

Bano

Sahu

et al. 2020

Environmental Research

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The COVID-19 pandemic, caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), is rapidly spreading across the globe due to its contagion nature. We hereby report the baseline permanent levels of two most toxic air pollutants in top ranked mega cities of India. This could be made possible for the first time due to the unprecedented COVID-19 lockdown emission scenario. The study also unfolds the association of COVID-19 with different environmental and weather markers. Although there are numerous confounding factors for the pandemic, we find a strong association of COVID-19 mortality with baseline PM 2.5 levels (80% correlation) to which the population is chronically exposed and may be considered as one of the critical factors. The COVID-19 morbidity is found to be moderately anti-correlated with maximum temperature during the pandemic period (−56%). Findings although preliminary but provide a first line of information for epidemiologists and may be useful for the development of effective health risk management policies.

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“…According to the National Ambient Air Quality Standards set by Central Pollution Control Board of India, the standard for ozone concentrations averaged over 8 hour exposure period is 100 µg m -3 or ~51 ppb (CPCB, 2009). In a recent study, Anand et al (2020) have reported that during 2017, the 8 hour average (10:00-18:00 hours) ozone mixing ratios in some parts of Pune reached over 70 ppb, with peaks of ~92 ppb. These values are much higher than the national air quality standards and show the need to reduce ozone in Pune.…”

Section: Seasonal and Diurnal Variationsmentioning

confidence: 98%

“…In this manuscript, simultaneous observations of NO2 and HCHO are being reported in Pune city for the first time, which aims at a better understanding of tropospheric chemistry (including ozone formation) in Pune city. A recent study (Anand et al, 2020) has shown that the average ozone concentration over Pune is higher than the National Ambient Air Quality Standards for ozone (CPCB, 2009). Hence, here we study in detail the ratio HCHO and NO2 to identify controlling factor for tropospheric ozone formation in Pune city.…”

Section: Introductionmentioning

confidence: 97%

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Year-long Concurrent MAX-DOAS Observations of Nitrogen Dioxide and Formaldehyde at Pune: Understanding Diurnal and Seasonal Variation Drivers

Biswas

Mahajan

2021

Aerosol Air Qual. Res.

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Year-long observations of nitrogen dioxide (NO2) and formaldehyde (HCHO) using the Multi-Axis Differential Absorption Spectroscopy (MAX-DOAS) technique are reported from Pune City, India. We studied the diurnal and seasonal variations, effect of biomass burning and the weekend effect on both species. NO2 diurnal profiles displayed a traffic induced peak at ~09:00 hrs. HCHO also showed a morning peak ~10:00 hrs due to production from oxidation of VOCs in the presence of solar radiation. Both NO2 and HCHO show the highest average concentrations during the winter (October, November, December, January and February-ONDJF), with mean mixing ratios of 2.0 ± 1.4 ppb and 3.0 ± 1.4 ppb, respectively. These observations suggest that a lower boundary layer (BL) height during ONDJF leads to higher concentrations of trace gases. During June, July, August, and September (JJAS), both trace gases show a minimum in their concentrations, with average mixing ratios for NO2 and HCHO being 0.9 ± 0.6 ppb and 1.1 ± 0.7 ppb, most likely due to removal by wet deposition. There was no significant difference in both the trace gases on weekdays and weekends. Using back-trajectory analysis, we conclude that air parcels coming from regions of biomass burning increased the concentrations in Pune. Emissions from nearby industrial areas of Bhosari and Pimpri-Chinchwad increased NO2 concentrations in Pune city. Finally, we compared the observations with previous reports over India and found that both HCHO and NO2 concentrations are lower in Pune compared to the other large cities in India.

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Gaseous pollutants over different sites in a metropolitan region (Pune) over India

Cited by 7 publications

References 23 publications

Disparity in ozone trends under COVID-19 lockdown in a closely located coastal and hillocky metropolis of India

Disparity in ozone trends under COVID-19 lockdown in a closely located coastal and hillocky metropolis of India

COVID-19 and environmental -weather markers: Unfolding baseline levels and veracity of linkages in tropical India

Year-long Concurrent MAX-DOAS Observations of Nitrogen Dioxide and Formaldehyde at Pune: Understanding Diurnal and Seasonal Variation Drivers

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