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Modeling of ground - level ozone formation in urban air - sheds of Sri Lanka

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dc.contributor.advisor Sugathapala AGT
dc.contributor.advisor Manthilake MMID
dc.contributor.advisor Lee SC
dc.contributor.author Perera GBS
dc.date.accessioned 2022
dc.date.available 2022
dc.date.issued 2022
dc.identifier.citation Perera, G.B.S. (2021). Modeling of ground - level ozone formation in urban air - sheds of Sri Lanka [Doctoral dissertation, University of Moratuwa]. Institutional Repository University of Moratuwa. http://dl.lib.uom.lk/handle/123/21190
dc.identifier.uri http://dl.lib.uom.lk/handle/123/21190
dc.description.abstract Physical phenomenon of the relation among ground-level ozone (O 3 ), oxides of nitrogen (NO X ) and volatile organic compounds (VOC) is governed by complex nonlinear photochemistry. To predict and control O 3 concentration, it is vital to know, how O 3 concentration changes in response to prescribed changes in source emissions of NO X and VOCs. In this research, a theoretical model was developed and validated for ground-level O 3 formation in urban air-sheds of Sri Lanka. Hourly averaged weekly results of ambient pollutant concentration data of eleven cities in the base years 2013, 2014 and 2015 in Sri Lanka was assessed and an urban air shed model was developed. The model was calibrated using influential parameters measured. Then Colombo as the most complicated urban air-shed in Sri Lanka was analyzed in detail. Model was validated using measured 24-hour air quality monitoring data from the mobile air quality monitoring stations at major traffic locations in Colombo in the year 2018 and 2019. Operational schedules of emission sources including train scheduled data, working hours of the thermal power plants, and vehicle counts were conducted at identified critical locations in Colombo to investigate the responsible sources. Gases from the exhaust line of different types of vehicles was collected and analyzed using Gas Chromatography Mass Spectroscopy (GCMS). Results confirm that there exist two regimes of NO X -VOC-O 3 sensitivity as NO x sensitive regime and VOC-sensitive regime. The urban air-shed model is capable of estimating the ground-level steady state ozone concentration (O 3ss ) and contributions from each regime. The univariate linear regression model using predicted and observed O 3 values confirmed that O 3ss concentration was significantly correlated with the predicted O 3 concentration. Analysis of urban air shed in Colombo also confirms the predicted and observed O 3ss concentration were significantly correlated. This research provides a detailed understanding of photochemical degradation on formation of ground-level O 3 in urban air-sheds of Sri Lanka and provides critical information for the scientific community and decision-makers to formulate air pollution mitigation policies. en_US
dc.language.iso en en_US
dc.subject ‘URBAN AIR-SHED’ en_US
dc.subject PHOTOCHEMICAL DEGRADATION en_US
dc.subject AIR POLLUTION MITIGATION INTERVENTIONS en_US
dc.subject URBAN ENVIRONMENTS - Sri Lanka. en_US
dc.subject GROUND - LEVEL OZONE en_US
dc.subject MECHANICAL ENGINEERING – Dissertation en_US
dc.title Modeling of ground - level ozone formation in urban air - sheds of Sri Lanka en_US
dc.type Thesis-Abstract en_US
dc.identifier.faculty Engineering en_US
dc.identifier.degree Doctor of Philosophy en_US
dc.identifier.department Department of Mechanical Engineering en_US
dc.date.accept 2022
dc.identifier.accno TH5062 en_US


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