005240000a22001450004500003000900000005001700009562002700026110007100053710010800124245003900232264006600271300000800337041000800345650002500353PH-MaWHO20241108112146.0  aEFP/81.21.-Unpublished  aWorld Health Organization. Regional Office for the Western Pacific  aWestern Pacific Regional Centre for the Promotion of Environmental Planning and Applied Studies (PEPAS)  aAir quality monitoring and control  aManila : bWHO Regional Office for the Western Pacificc1981.  a1v.  aeng  aEnvironmental health