PM10 and PM2.5
Detailed results of the measurement are shown in Table 2.
Almost all the values of PM10 in the H area exceeded the
NAAQS, except in Pathumwan at night. The L area at
Prachasumran and Talad-Ku, as well as Ayutthaya,
showed low PM10 (34–74 µg/m3 in the daytime and 54–
89 µg/m3 in the nighttime). PM2.5 in the H area varied
between 82 and 143 µg/m3 in the daytime and between
45 and 146 µg/m3 at night. In the L area, PM2.5 varied
between 24 and 47 µg/m3 in the daytime and between
34 and 54 µg/m3 at night.
The ratio of PM2.5-10 to PM2.5 in outdoor air was 0.35
in the H area and 0.40 in the L area; that is, the proportions
of PM2.5 to PM10 were 0.74 and 0.72, respectively,
and the correlation coefficient of PM2.5-10 and PM10 was
0.898 in the H area and 0.650 in the L area. The personal
PM10 and PM2.5
Detailed results of the measurement are shown in Table 2.
Almost all the values of PM10 in the H area exceeded the
NAAQS, except in Pathumwan at night. The L area at
Prachasumran and Talad-Ku, as well as Ayutthaya,
showed low PM10 (34–74 µg/m3 in the daytime and 54–
89 µg/m3 in the nighttime). PM2.5 in the H area varied
between 82 and 143 µg/m3 in the daytime and between
45 and 146 µg/m3 at night. In the L area, PM2.5 varied
between 24 and 47 µg/m3 in the daytime and between
34 and 54 µg/m3 at night.
The ratio of PM2.5-10 to PM2.5 in outdoor air was 0.35
in the H area and 0.40 in the L area; that is, the proportions
of PM2.5 to PM10 were 0.74 and 0.72, respectively,
and the correlation coefficient of PM2.5-10 and PM10 was
0.898 in the H area and 0.650 in the L area. The personal
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