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ARRPET Phase II Updates

By UAQ

The ARRPET Phase II sampling is being done in three sites; two of which are urban mixed sites (Manila Observatory or MO & Cebu or CB) and one background site (Gabaldon or GB). Average PM2.5 concentrations in the urban mixed sites are 34 μg/m3 (MO) and 33 μg/m3 (CB) while that in the background site is 11 μg/m3. Average PM10 concentrations in MO and Cebu are 51 μg/m3 and 44 μg/m3, respectively, while that of the background site is 16 μg/m3.

Reconstructed mass of PM taken during the dry season shows that sulfate and trace metals seem to be uniform across the three sites.

Preliminary PMF results of the MO data show that traffic and sulfate have the highest contribution in the fine fraction in both the dry and wet seasons. Other identified sources are nitrate, biomass burning, seasalt, and soil. The coarse fraction is mainly from soil sources, with minor contributions from seasalt and nitrate.

PM2.5 Source Identification through a Modified Potential Source Contribution Function (PSCF)

By K. U. Cheng Chua and G. H. Lorenzo

Receptor models based on the traditional mass balance approach provide quantified source identification and apportionment which does not include spatial/directional information of the sources. Application of trajectory-based models of which PSCF is a part of, easily mitigates such a problem. In the absence of reliable airmass backward trajectories for the chosen receptor site (Manila Observatory, Quezon City), the original PSCF formulation of a gridbased study area was modified to use categorized wind directions and speeds instead. Using this modified function, windroses of PSCF values were produced to facilitate a better informed source identification based on their directionality from to the receptor site.

PM2.5 Source Identification through a Modified Potential Source Contribution Function (PSCF)

By K.U. Cheng Chua and G.R.H. Lorenzo

Description not available.

Integrated Environmental Strategies Philippines Project Report Metropolitan Manila: Focus on the Transport Sector

By Manila Observatory

Description not available.