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초록

As demand for air quality information increases and the use of low-cost particulate
matter(PM) measuring instruments expands, there is growing demand for evaluation of
the reliability and performance of these PM sensors. In this study, 4 types of
commercialized laser based light scattering PM sensors were evaluated by comparing
their output, over 5 days from July 23 to July 28, 2018, with a reference PM analyzer
(beta ray absorption method) in the Gangnam urban air quality monitoring station in
Seoul, Korea. Possible meteorological effects on low-cost PM sensors were investigated
to improve their performance. All low-cost PM sensors overestimated concentrations of
both PM10 and PM2.5, relative to the reference data. A higher error tendency was
evident in higher relative humidity conditions. Low-cost PM sensors showed error ranges
from 30.24∼102.75% for PM2.5 and 17.75∼59.61% for PM10, showing them to be
unsatisfactory for complementary PM monitoring. When low-cost PM sensors