Studies Indicate 80% of Urban Air Pollution Created by Motor Vehicles
「Studies Indicate 80% of Urban Air Pollution Created by Motor Vehicles」於資料集「MajorEnvironmentalPolicies」由單位「行政院環境保護署」的陳小姐所提供，聯繫電話是(02)23117722#2753,(02)23117722#2756，最近更新時間為：2023-07-30 01:03:45。 欄位編號的內容是186 ， 欄位標題的內容是Studies Indicate 80% of Urban Air Pollution Created by Motor Vehicles ， 欄位摘要的內容是The EPA took advantage of routine air raid drills in three major urban areas to take air quality readings. The results indicated that CO and NOx concentrations fell by about 80% after vehicles came to a halt and that levels quickly returned to normal once traffic began moving. ， 欄位全文的內容是The EPA took advantage of routine air raid drills in three major urban areas to take air quality readings. The results indicated that CO and NOx concentrations fell by about 80% after vehicles came to a halt and that levels quickly returned to normal once traffic began moving.Comparison of air pollution in urban areas between traffic and non-traffic situations Pollutant Taipei Taichung Kaohsiung CO Avg. concentration (ppm) 3.00 1.50 3.00 Vehicles stationary (ppm) 0.50 0.50 0.50 Reduction (%) 83.33 66.67 83.33 NOX Avg. concentration (ppb) 300.00 60.00 200.00 Vehicles stationary (ppb) 50.00 10.00 50.00 Reduction (%) 83.33 3.33 75.00 To understand the direct relationship between air quality and motor vehicle emissions the EPA took advantage of routine air raid drills that prohibit traffic movement to take air quality readings in three major urban areas. In mid-April, air pollution concentration measurements were taken in the Taipei, Taichung and Kaohsiung metropolitan areas. The results indicated that car and motorcycle emissions account for about 80% of air pollutants in those urban areas.According to data collected during an April 23 air raid drill in the Taipei metropolitan area, carbon monoxide (CO) concentrations taken by ground-based monitoring stations fell rapidly after traffic came to a halt. After 20 minutes, CO concentrations fell from 3 ppm to 0.5 ppm at its lowest stable reading or 17% of normal levels. Nitrogen oxide (NOx) concentrations fell from 300 ppb to 50 ppb or the same percentage as CO (see table 2). Sulfur oxides (SOx) did not decline by an appreciable amount relative to the others. Pollutant concentrations quickly returned to their normal levels 15 minutes after the drill ended.Ground-based monitoring conducted on April 17 during the air raid drill in Taichung metropolitan area followed suit with a rapid drop in CO just 20 minutes after traffic came to a halt. CO concentration fell from 1.5 ppm to 0.5 ppm while NOx concentration went from 60 ppb to 10 ppb. The concentration of CO2 shrunk to 50% of normal levels. Pollutant concentrations quickly returned to their normal levels once vehicles began to move again.The same scenario took place in the Kaohsiung metropolitan area. Ground-based mobile monitoring stations yielded an 80% drop in CO within 30 minutes and a 25% fall in NOx. Pollutant concentrations swiftly rebounded to their normal levels after the drill ended.The survey results clearly indicate the degree to which motor vehicles contribute to air pollution in urban areas. Cars and motorcycles account for about 60% to 80% of CO emissions. In the Taipei and Taichung metropolitan areas, NOx concentrations fell by 83% on average while that for Kaohsiung declined by only 75% perhaps due to the presence of industrial pollution sources in the area. The fluctuation in SOx concentration was relatively small probably because it was already at a relatively low level.The results of the survey could be used as a reference in estimating potential results of emergency response measures adopted during a period of severe air quality degradation. As traffic pollution currently accounts for over 80% of air pollution and is rising steadily, the results also highlight the increasing importance of reducing vehicle-generated emissions. ， 欄位年度的內容是1999 ， 欄位月份的內容是1 ， 欄位卷的內容是2 ， 欄位期的內容是1 ， 欄位順序的內容是1 ， 欄位倒序的內容是2 ， 欄位分類的內容是air ， 欄位標題2的內容是Studies Indicate 80% of Urban Air Pollution Created by Motor Vehicles ， 欄位檔案位置的內容是V2/V2-01 。
編號
186
標題
Studies Indicate 80% of Urban Air Pollution Created by Motor Vehicles
摘要
The EPA took advantage of routine air raid drills in three major urban areas to take air quality readings. The results indicated that CO and NOx concentrations fell by about 80% after vehicles came to a halt and that levels quickly returned to normal once traffic began moving.
全文
The EPA took advantage of routine air raid drills in three major urban areas to take air quality readings. The results indicated that CO and NOx concentrations fell by about 80% after vehicles came to a halt and that levels quickly returned to normal once traffic began moving.Comparison of air pollution in urban areas between traffic and non-traffic situations Pollutant Taipei Taichung Kaohsiung CO Avg. concentration (ppm) 3.00 1.50 3.00 Vehicles stationary (ppm) 0.50 0.50 0.50 Reduction (%) 83.33 66.67 83.33 NOX Avg. concentration (ppb) 300.00 60.00 200.00 Vehicles stationary (ppb) 50.00 10.00 50.00 Reduction (%) 83.33 3.33 75.00 To understand the direct relationship between air quality and motor vehicle emissions the EPA took advantage of routine air raid drills that prohibit traffic movement to take air quality readings in three major urban areas. In mid-April, air pollution concentration measurements were taken in the Taipei, Taichung and Kaohsiung metropolitan areas. The results indicated that car and motorcycle emissions account for about 80% of air pollutants in those urban areas.According to data collected during an April 23 air raid drill in the Taipei metropolitan area, carbon monoxide (CO) concentrations taken by ground-based monitoring stations fell rapidly after traffic came to a halt. After 20 minutes, CO concentrations fell from 3 ppm to 0.5 ppm at its lowest stable reading or 17% of normal levels. Nitrogen oxide (NOx) concentrations fell from 300 ppb to 50 ppb or the same percentage as CO (see table 2). Sulfur oxides (SOx) did not decline by an appreciable amount relative to the others. Pollutant concentrations quickly returned to their normal levels 15 minutes after the drill ended.Ground-based monitoring conducted on April 17 during the air raid drill in Taichung metropolitan area followed suit with a rapid drop in CO just 20 minutes after traffic came to a halt. CO concentration fell from 1.5 ppm to 0.5 ppm while NOx concentration went from 60 ppb to 10 ppb. The concentration of CO2 shrunk to 50% of normal levels. Pollutant concentrations quickly returned to their normal levels once vehicles began to move again.The same scenario took place in the Kaohsiung metropolitan area. Ground-based mobile monitoring stations yielded an 80% drop in CO within 30 minutes and a 25% fall in NOx. Pollutant concentrations swiftly rebounded to their normal levels after the drill ended.The survey results clearly indicate the degree to which motor vehicles contribute to air pollution in urban areas. Cars and motorcycles account for about 60% to 80% of CO emissions. In the Taipei and Taichung metropolitan areas, NOx concentrations fell by 83% on average while that for Kaohsiung declined by only 75% perhaps due to the presence of industrial pollution sources in the area. The fluctuation in SOx concentration was relatively small probably because it was already at a relatively low level.The results of the survey could be used as a reference in estimating potential results of emergency response measures adopted during a period of severe air quality degradation. As traffic pollution currently accounts for over 80% of air pollution and is rising steadily, the results also highlight the increasing importance of reducing vehicle-generated emissions.
年度
1999
月份
1
卷
2
期
1
順序
1
倒序
2
分類
air
標題2
Studies Indicate 80% of Urban Air Pollution Created by Motor Vehicles
檔案位置
V2/V2-01
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