03425cas|a2200421 a 4500 20260817162018.0 041199s1999 th uu|m rtt 0| a1eng d .b11765203 AIT Thesis no. EV-99-31 Nguyen Tan Phong Air pollutant levels associated with traffic volume : a case study of motorcycles in Bangkok Bangkok : Asian Institute of Technology, 1999 50, [18] leaves Thesis ; no. EV-99-31 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development Thesis (M.Eng.) - Asian Institute of Technology, 1999 This study focused on exhaust gas em1ss1on from two-stroke and four-stroke motorcycle engines. Ambient air quality and traffic volume of vehicle in Bangkok was also examined. Testing exhaust gas emission under idle conditions shows that concentration emission from two-stroke is higher than four-strokes. Carbon monoxide (CO) emission is relatively low in both two and four-stroke engine. Hydrocarbon (HC) emission from two stroke engines is higher than standard. Driving cycle test shows that exhaust gas emission from two and four-stroke engine is higher than standard, while HC emitted from four-stroke is lower. The study also shows that benzene in ambient air exceeded the WHO guidelines. The main air pollution problem in Bangkok is suspended particulate matter (SPM) and particulate matter (PM-10). Particulate concentration in Bangkok streets is relatively high and reaches alarming levels due to the poor engine tuning and maintenance, and engine overloading. Carbon monoxide (CO) during the daytime varies from peak to non-peak hours and vehicle emission contributes to the concentration of CO in ambient air. The number of motorcycles takes into account of 25-30 percent of total number of vehicles. Finally, air pollution in Bangkok has reached alarming level, requiring immediate measure to reduce and minimize impact on human health and the environment. Motorcycles Thailand Bangkok Air Pollution Thailand Bangkok Samorn Muttamara, Chairperson Nguyen, Cong Thanh, Examination Committee Preeda Pakpian, Examination Committee Swedish International Development Cooperation Agency (Sida), Scholarship donor Asian Institute of Technology. Thesis ; no. EV-99-31 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B12097 .b11765203 mnait y 240331 0 991104 m a y 0 mnait mnait mnarc 20 40 Barcode : 30050120652408 CREATED : 1998-01-06 RECORD # : i12159487 LPATRON : 1024874 LCHKIN : 2013-10-28 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 13 TOT RENEW : 6 Barcode : 30050120652416 CREATED : 1998-01-06 RECORD # : i12159499 LPATRON : 1026947 LCHKIN : 2016-08-29 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 21 TOT RENEW : 6 Barcode : 30050160077433 CREATED : 2016-05-23 RECORD # : i12988327 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 3502 3502 0 0 0 0 MAIN MAIN mnait 2026-08-17 5.00 0 AIT Thesis no. EV-99-31 30050120652408 2026-08-17 16:20:18 1 2026-08-17 20 0 0 0 0 MAIN MAIN mnait 2026-08-17 5.00 0 AIT Thesis no. EV-99-31 30050120652416 2026-08-17 16:20:18 2 2026-08-17 20 0 0 0 0 MAIN MAIN mnarc 2026-08-17 0 AIT Thesis no. EV-99-31 30050160077433 2026-08-17 16:20:18 2026-08-17 40