Suspended particulate matter(SPM) emission from road traffic is considered one of the major contributors of air pollution in Metro Manila. This has worsened the condition of the urban air quality brought about by rapid economic development. In this perspective, the study aims to assess the relationship of roadside SPM emission levels with the traffic flow characteristics of specific vehicle types and wind velocity in open and semi-open space land use types. Monitoring results showed that the daily average SPM concentration measured at roadside locations occasionally exceeded the proposed national standard of 150 mg/m3 especially along arterial roads with relatively high truck traffic volume. Regression models relating roadside SPM concentration as a function of arterial road traffic flow and wind velocity are developed specifically for open and semi-open space land use types. Combined data from the two monitoring stations that incorporated land use type as one of the variables is also modeled.
