While recent research shows that finer species of particles (PM10 and PM2.5) have more serious health impacts, the majority of air quality monitoring in the Philippines still focus on TSP. While TSP levels are monitored by 39 monitoring stations in 13 regions very few sites monitor particulates and gaseous pollutants. Only 4 stations measure PM10 and 7 stations measure gaseous pollutants. Only four regions (e.g., Region 7, Region 10, Region 11, Cordillera Autonomous Region (CAR)) have continuous automatic ambient air quality monitoring stations which measure SO2, NO2, and O3 by the DENR, PNRI and MO (Annex 2).