Effect of Boundary Layer Evolution on Nitrogen Dioxide (NO2) and Formaldehyde (HCHO) Concentrations at a High-altitude Observatory in Western India

Biswas, Mriganka Sekhar; Pandithurai, G.; Aslam, Mohammad; Patil, Rajendra D.; Anilkumar, V.; Dudhambe, Shrikant D.; Lerot, Christophe; Smedt, Isabelle De; Roozendaël, Michel Van; Mahajan, Anoop S.

doi:10.4209/aaqr.2020.05.0193

Cited by 5 publications

(4 citation statements)

References 40 publications

(56 reference statements)

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“…Satellite-recorded formaldehyde concentrations take into account the entire atmospheric column from the ground to the sensor-which, in the case of TROPOMI, is at an altitude of 824 km. However, HCHO is a short-lived constituent that remains below the planetary boundary layer (up to 3 km), with higher concentrations near the surface [26,28]. In order to make it possible to compare the concentrations monitored by TROPOMI and those monitored by surface stations, presented by other works [37,[63][64][65], a methodology was proposed to estimate the surface formaldehyde concentration in the MASP, converting the data in mol/m² to ppbv.…”

Section: Estimate Of Hcho Surface Concentrationmentioning

confidence: 99%

“…This is a problem for the remote monitoring of tropospheric ozone, since the highest concentrations of O 3 are found in the stratosphere, requiring the use of algorithms that make estimates based on the collected data [27]. However, because of its lifetime of a few hours, formaldehyde remains close to the surface, below the planetary boundary layer [28], which increases the reliability of the data and allows inferences to be made about its VOC precursors that also have a short lifetime (thus, they are oxidized and produce formaldehyde near the location where they were emitted) [29][30][31], on the photochemical activity of the atmosphere [32,33] and on tropospheric ozone concentrations, improving the aforementioned algorithms [27].…”

Section: Introductionmentioning

confidence: 99%

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Atmospheric Formaldehyde Monitored by TROPOMI Satellite Instrument throughout 2020 over São Paulo State, Brazil

Freitas

Fornaro

2022

Remote Sensing

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We aimed to study the daily formaldehyde (HCHO) columns over urban and forested areas in São Paulo State, Brazil, from rhe TROPOMI spectrometer onboard the Sentinel-5P satellite during 2020. Nineteen specific areas were defined in four regions: 3 areas in each of two preserved Atlantic Forests (PEMD and PETAR), 3 in a sugarcane growing region (NERG) and 10 in the Metropolitan Area of São Paulo (MASP), among which 2 areas are in the Morro Grande reserve, which is a significant remnant of Atlantic Forest outside the densely urbanized area of MASP. An analysis of variance and Tukey’s test showed that the mean annual columns over the Morro Grande reserve (1.69±1.05×10−4 mol/m² and 1.73±1.07×10−4 mol/m²) presented greater statistical similarity with the forest and rural areas of the state (<1.70×10−4 mol/m²) than with MASP (>2.00×10−4 mol/m²), indicating few effects from megacity anthropogenic emissions. Case studies addressing selected days in 2020 showed that fires in and around the state were related to episodes of maximum density of HCHO columns. The results showed significant seasonality, with lower concentrations during summer (wet season) and higher concentrations during winter and spring (dry and transition dry–wet seasons).

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Section: Estimate Of Hcho Surface Concentrationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Atmospheric Formaldehyde Monitored by TROPOMI Satellite Instrument throughout 2020 over São Paulo State, Brazil

Freitas

Fornaro

2022

Remote Sensing

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“…Among the pollutants of motor vehicle exhaust, CO makes the largest contribution to motor vehicle exhaust. NO2 is the most toxic of the NOx and can form photochemical smog (Zamorategui-Molina et al, 2021;Biswas et al, 2021;Liu et al, 2022). These harmful gases diffuse into the air will cause air pollution and harm the human body.…”

Section: Introductionmentioning

confidence: 99%

Impact of Motor Vehicle Exhaust on the Air Quality of an Urban City

Wang

Wang²,

Liu³

et al. 2022

Aerosol Air Qual. Res.

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The development of the economy and the prosperity of the industry have not only promoted the great progress of motor vehicle industry, but also made the number of motor vehicles in large and medium cities increase rapidly. In recent years, with the increasing number of urban motor vehicles, the environmental pollution caused by motor vehicle exhaust on both sides of the road has become increasingly serious. The high concentration of pollutants emitted by motor vehicles will seriously affect and threaten the health of pedestrians on both sides of the road and surrounding residents. In this work, the environmental monitoring data (NO2) from different areas of Jinan city over different time periods were summarized from 2001 to 2007. It was found that the NO2 concentration in the ambient air of Jinan gradually decreased due to the treatment of motor vehicles taken in Jinan for the 29 th Olympic Games in 2005, the NO2 concentration during the urban heating period fell by nearly 70%, and the air during the urban heating period was significantly higher than that in the non-heating period. In 2004, the concentration of NO2 in the air during the urban heating period was nearly twice as high as during the non-heating period. Taking the city of Jinan, China in 2008 as an example, the contribution of motor vehicle emissions to the ambient air quality in Jinan, especially CO and NO2, was investigated through real-time monitoring of pollutants emitted by motor vehicles on several main roads in Jinan. The results showed that the pollutants emitted by motor vehicles in Jinan, especially CO and NO2, contribute greatly to the ambient air quality of Jinan. Among them, the highest average CO concentration was measured beside Jingqi Road, which was attributed to poor vehicle driving conditions and low speeds due to congestion on Jingqi Road. The necessary motor vehicle exhaust control measures were proposed.

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“…As concentrações de formaldeído registradas por satélite levam em consideração toda a coluna atmosférica, desde o solo até o sensorque, no caso do TROPOMI, está a uma altitude de 824 km. No entanto, o HCHO é um constituinte de vida curta e que se mantém abaixo da camada limite planetária (até 3 km), com concentrações maiores próximo à superfície (BISWAS et al, 2021;SCHROEDER et al, 2016). De modo a possibilitar a comparação entre as concentrações monitoraradas pelo TROPOMI e as monitoradas por estações em superfície, apresentadas por outros trabalhos, propôs-se uma metodologia para estimar a concentração em superfície, convertendo os dados em 10 -4 mol/m² para Considerando as alturas médias para cada mês, a metodologia proposta considera que todo o formaldeído registrado em uma coluna atmosférica se encontra homogeneamente distribuído abaixo da CLP.…”

Section: Estimativa Da Concentração Em Superfícieunclassified

Formaldeído na atmosfera urbana e florestal: dados de satélite para o estado de São Paulo

Freitas¹

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Effect of Boundary Layer Evolution on Nitrogen Dioxide (NO2) and Formaldehyde (HCHO) Concentrations at a High-altitude Observatory in Western India

Cited by 5 publications

References 40 publications

Atmospheric Formaldehyde Monitored by TROPOMI Satellite Instrument throughout 2020 over São Paulo State, Brazil

Atmospheric Formaldehyde Monitored by TROPOMI Satellite Instrument throughout 2020 over São Paulo State, Brazil

Impact of Motor Vehicle Exhaust on the Air Quality of an Urban City

Formaldeído na atmosfera urbana e florestal: dados de satélite para o estado de São Paulo

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