Characterization of Particulate Matter Collected at Mysore City Roadways in Association with Urban Traffic Condition

Fauzie, Azis Kemal; Venkataramana, G. V.

doi:10.9734/acri/2017/36803

Cited by 6 publications

(3 citation statements)

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“…Higher wind speeds at this higher altitude enabled representative dilution effects and therefore samples collected from this procedure were subjected to Dynamical Light Scattering (DLS) size characterisation techniques described later. As stipulated by the Bureau of Indian Standard the following points were considered (Kumar, 2021): Maintaining a density difference between the dispersed particles and the dispersing medium. Using established vortexing methods followed by a segregation of over‐sized particles (

r > 5 μm

) using standard wet sieving techniques (Fauzie & Venkataramana, 2017; Kumar, 2021; Pecora, 2000). In this instance, the collected soot particles were ultra‐sonicated (Make: SONICS Vibra Cell) in double‐distilled water at a fixed pulse duration of 30 s lasting up to 10 min. …”

Section: Methodsmentioning

confidence: 99%

“…ii. Using established vortexing methods followed by a segregation of over-sized particles (r > 5 μm) using standard wet sieving techniques (Fauzie & Venkataramana, 2017;Kumar, 2021;Pecora, 2000). In this instance, the collected soot particles were ultra-sonicated (Make: SONICS Vibra Cell) in double-distilled water at a fixed pulse duration of 30 s lasting up to 10 min.…”

Section: Ascertaining Particle Size Distributionmentioning

confidence: 99%

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An experimental and modelling analysis of cloud droplet growth from vehicular emissions with non‐ideal microphysics over an Asian mega‐city

Gumber

Ghosh

2022

Atmospheric Science Letters

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Large cities in the developing world have unregulated traffic with dysfunctional diesel operated vehicles spewing out copious amounts of micron to sub‐micron sized soot and black carbon particles. These particles mix with other aerosol particles as they are lifted by buoyant eddies. It is shown that the particles are rendered partly soluble as they get coated with soluble sulphate to activate into cloud droplets. This multi‐component aerosol mixture thus comprises of fully soluble as well as partially soluble components so that mass accommodation and diffusional mass transfer considerations need to be carefully quantified over small non‐planar surfaces of aerosol particles sourced from such emissions. The emitted soot and black carbon particles have number concentrations comparable to the sulphate mode and are small enough that the assumption of an infinitely dilute solution droplet is untenable. An X‐ray fluorescence spectrometry indicates the presence of inorganic ions confirming the validity of non‐ideal solution effects warranting a closer look at the osmotic coefficients. Additionally, laboratory values of the binary diffusion coefficients of water vapour cannot be applied to processes operating over the cloud base located several kilometres above where the pressure and temperature are different. A full Lennard‐Jones diffusivity model is used with an accounting of the dipole moment of water vapour which most models ignore. This first study, combining these micro‐scale enhancements are included in a Weather Research and Forecasting (WRF) case study over an Asian city. Not only are significant differences obtained in the cloud morphology when compared to a baseline case, but modelled cloud optical depths agree better with observations.

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r > 5 μm

Section: Methodsmentioning

confidence: 99%

Section: Ascertaining Particle Size Distributionmentioning

confidence: 99%

An experimental and modelling analysis of cloud droplet growth from vehicular emissions with non‐ideal microphysics over an Asian mega‐city

Gumber

Ghosh

2022

Atmospheric Science Letters

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“…It lies at 12° 18' 25" N latitude and 76° 38' 58" E longitude. The altitude of the city is 765 m above mean sea level (Fauzie and Venkataramana 2017). Five sites were chosen for the air pollutant sampling based on vehicular traffic and street landscape, either street canyon or open landscape.…”

Section: Study Areamentioning

confidence: 99%

Dispersion of Nitrogen Dioxide and Particulate Matter Concentrations in Street Canyons and Open Landscape in Urban Mysore

Nataraj

Fauzie

Rani

et al. 2020

ash

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The variation in nitrogen dioxide (NO2), particulate matter (PM10 and PM2.5) concentrations and meteorological data were analyzed at different types of urban spaces in Mysore consisting of four street canyons and one open landscape sites. The NO2 and PM levels were measured using portable monitoring device and respirable dust sampler, respectively. The maximum NO2 concentration was found at the intersection of both street canyons and open landscape, either in the morning (70-160 µg/m3) or evening (20-60 µg/m3). Result found that concentration of NO2 in street canyons was significantly higher than in open landscape sites (p < 0.001). The ambient NO2 levels were also found lower in the cross roads compared to such in the main roads. The high number of vehicles passing through the roads accounts for the higher NO2 concentration as we found significant positive correlation between traffic volume and NO2, SPM, PM10 and PM2.5 concentrations, either in the street canyon and open landscape sites. Furthermore, a negative association has been observed between both SPM and NO2 levels and the wind speed (p = 0.002 and p < 0.05 respectively). The factors affecting the different dispersion characteristics of air pollutants were found to be the wind speed, vehicular traffic, and site landscape where congested with high number of tall buildings.

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A probabilistic framework for identifying anomalies in urban air quality data

Khatri,

Shakya,

Kumar

2024

Environ Sci Pollut Res

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Characterization of Particulate Matter Collected at Mysore City Roadways in Association with Urban Traffic Condition

Cited by 6 publications

References 0 publications

An experimental and modelling analysis of cloud droplet growth from vehicular emissions with non‐ideal microphysics over an Asian mega‐city

An experimental and modelling analysis of cloud droplet growth from vehicular emissions with non‐ideal microphysics over an Asian mega‐city

Dispersion of Nitrogen Dioxide and Particulate Matter Concentrations in Street Canyons and Open Landscape in Urban Mysore

A probabilistic framework for identifying anomalies in urban air quality data

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