Browsing by Author "KARUNASINGHE, AWJ"

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    Ambient air quality study of the pollution caused by vehicular exhaust emissions in the city of Colombo.
    (University of Colombo: UC(SCI)., 1998) KARUNASINGHE, AWJ
    The study was performed to determine the concentrations of particulatematter (total suspended perticulate and fine dust), lead, polycyclic hydrocarbons, total hydrocarbone, non-methane hydrocarbons, methane sulphur dioxide and carbon monoxide in the air on regular basis at seven selected intersections in the city of colombo during the period from 1990 to 1993 primary climatic data such as humidity rainfall wind speed were also recorded especially during air sampling for particulate matter.Total Suspended, particulate (TSP) and fine dust (FD) measured using a high volume air sampler indicated that the average TSP concentration was 404 ug/m3 with a variation between 100-960 ug/m3 for 8 hour period more than 50 of the time TSP concentration was above 300 ug/m3 TSP and FD concentrations were found at higher levels exceeding the standards of Sri Lanka and World Health Organization(WHO). The average values of TSP on Sundays were found to be 274 ug/m3 which indicated that the TSP values were low by an average of 32 of week-days TSP levels. This could be due to lesser traffic moving on Sundays which wasabout 50 of weekdays traffic. A linear relationship was found for TSP level and traffic densities atthree sampling sites namely Maradana Wellawatta and Borella. The correlation coefficients were 0.97, 0.84 and 0.71 respectively....