ĐÁNH GIÁ CHẤT LƯỢNG KHÔNG KHÍ TRONG NHÀ: SỰ PHÂN BỐ NỒNG ĐỘ CÁC HẠT BỤI VÀ KIM LOẠI NẶNG

  • Trần Đình Trinh

Tóm tắt

Indoor and outdoor ultrafine, accumulation mode, fine and coarse fractions collected at one preschool
in Hanoi capital, Vietnam were characterized in terms of mass-size distribution and elemental
composition. The sampling campaigns were performed simultaneously indoors and outdoors during
four consecutive weeks. Indoor average concentration of CO2 and CO were below the limit values
recommended by ASHRAE (1000 ppm for CO2) and WHO (7 mg/m3
for CO). Indoor concentrations of
PM2.5 and PM10 were strongly influenced by the presence of children and their activities indoors,
averaging 49.4 µg/m3
(PM2.5) and 59.7 µg/m3
(PM10). At peak time with intensive activities, indoor
PM10 concentration could reach 1,200 µg/m3
, several times higher than limited values (150 µg/m3
)
applied to ambient air (QCVN 05:2013/BTNM). Mass-size distribution of indoor and outdoor particles
presented similar patterns, in which ultrafine particles accounted for around 15-20% while fine
particles (PM2.5) made up almost 80% of PM10. O was the most abundant elements followed by C for
indoor and outdoor particles. O accounted for 22.9% to 37.4% of indoor particles while those figures
for C element were in the range of 13.2-23.4%. Mass proportion of crustal, major elements could make
up 50%, whereas trace elements accounted for less than 0.5% of indoor and outdoor airborne
particles.

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Phát hành ngày
2023-03-02