Panich Intra and Thanesvorn Siri-achawawath

DOI: 10.14456/sjst-psu.2019.169

pp. 1339 - 1347

Abstract

An online particulate monitoring system for measuring the mass and number concentrations and size distributions of
ambient particulate matter was developed and field tested in this study. The developed monitoring system consisted of electrostatic PM mass monitor (EPMM), NanoScan-SMPS, data acquisition and wireless communication systems, and monitoring station structure with an air conditioning system. In this study, the monitoring station was placed and field evaluated in Chiang Mai
University Mae-Hia, Mae-Hia, Mueang Chiang Mai District, in Chiang Mai Province, Thailand. The field study results showed
that the trend of the average of the particle number concentration measured by the NanoScan-SMPS agreed to within small
differences with the particle mass concentration of PM10 and PM2.5 measured by the EPMM. The 1hour-average PM10 and
PM2.5 mass concentrations measured by EPMM were about 32.07 µg/m³
and 28.64 µg/m³
, respectively, and the 1hour-average
number concentration of sub-400 nm particle measured by the NanoScan-SMPS was found about 5,262.00 particles/m³
. Particle
size distribution measured by the NanoScan-SMPS was found in the size range from about 11.5 to 365.2 nm. This proved the
developed system particularly useful as an online, low cost continuous monitor for the measurement of the mass and number
concentrations and size distributions of ambient PM10, PM2.5 and sub-400 nm.