TAILIEUCHUNG - Indoor outdoor particle number concentrations under conditions of vehicles and meteorology

The intermittent particle concentration measurements were conducted in an apartment including three bedrooms on the fourth floor of a building 50-m away from the center of a busy road. There were no people and pet living in the study apartment during study periods. | 48 INDOOR/OUTDOOR PARTICLE NUMBER CONCENTRATIONS UNDER CONDITIONS OF VEHICLES AND METEOROLOGY Thai Phuong Vu1, Nguyen Tri Quang Hung2 1 University of Natural Resources and Environment, Ho Chi Minh city 2 Nong Lam University, Ho Chi Minh city Email: tpvu@ ABSTRACT The intermittent particle concentration measurements were conducted in an apartment including three bedrooms on the fourth floor of a building 50-m away from the center of a busy road. There were no people and pet living in the study apartment during study periods. Two bedrooms were chosen for this study. One room (R1) has a window directly facing the road. Another room (R2) has a window facing the street directly through a space of about 1 m. Number concentration and size distributions of particles ( nm) were determined by using a system of TSI Scanning Mobility Particle Sizer. Larger particles were determined by using a TSI Aerodynamic Particle Sizer model 3321 ( µm). The study results showed that traffic volume, wind speed and direction were key factors affecting outdoor and indoor pollutant number concentrations. The average outdoor, R1 and R2 particle number concentrations were 19322, 7785, 1967 particles/ cm3, respectively for particles of nm and 288, 132, 33 respectively for particles of µm. Peak indoor and outdoor particle number concentrations occurred as high traffic volume and the apartment located downwind as well as under calm wind conditions. Indoor/outdoor particle number concentration-based ratios of particles ranging sizes of nm and µm are ± and ±, respectively at R1 and those were ± and ±, respectively at R2. The bedroom with the window not facing the road directly was less affected than the bedroom with the window facing the road. Key words: Apartment, Indoor/outdoor particle concentration, Meteorology, Vehicle. TÓM TẮT Nghiên cứu sự biến đổi nồng độ hạt bụi được thực hiện trong một căn hộ gồm ba

• Môi trường
• Outdoor particle concentration
• Peak indoor
• Outdoor particle
• Indoor particle concentration
• System of TSI