as the total particle from Nanoparticle assumed TSP were compared with high volume sampler from PCD air quality monitoring station in that area. In Chulalongkorn station, collected PM1, PM2.5 and PM10 by Nanoparticle were compared with a cascade impactor while the total particle from Nanoparticle assumed TSP were compared with high volume sampler (TSP of nanosampler is the total concentrations in all stages of sampler and NA is not
applicable).