Renato R. Abcede
The purpose of this study is to apply the Gaussian Model in estimating relative air pollution concentration over the Metropolitan Manila arising from urban continuous point sources.
The computations were carried out using a fifteen meter effective height of all continuous point sources. The calculation of relative pollution concentrations at the ground and at the 15-meter level was made using a diffusion equation whose primary variables are thermal stability, the generalized diffusion coefficients, and wind speed and direction.
Prevailing wind speed and direction over the study area for each month were used in the computations. Average concentrations for each month over the domain represented by a system of 1-km grid squares for three different stability conditions (unstable, neutral and moderate inversion) were computed. Values were analyzed and isopleths of pollution concentrations were presented.
The results show that:
- During the Northeast Monsoon, pollution concentrates in the Guadalupe (Makati), Bagong Ilog (Pasig), Ermita and Pandacan (Manila) and Baclaran (Rizal) areas.
- During the Southwest Monsoon, pollution concentration concentrate in the Guadalupe, Bagong Ilog, Ermita and Pandacan, Baclaran and also in the Cubao and Balintawak (Quezon City) areas.
- During the transition period from the Northeast to the Southwest monsoon seasons, pollutants were noted to be concentrated in the Guadalupe, Mandaluyong, Cubao and Quiapo areas.
- Maximum concentration at the ground and at 15-meter level were observed to be relatively closer to the source in an unstable condition and relatively far downwind of the source in a stable condition.