Characterization of large fleets of vehicle exhaust emissions in middle Taiwan by remote sensing

Ko, Ya‐Wen; Cho, Chi-Hung

doi:10.1016/j.scitotenv.2005.05.040

Cited by 24 publications

(11 citation statements)

References 13 publications

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“…A vehicle's emission is determined based on gaseous concentration measurements immediately before and after the vehicle's passage through the remote sensing site. Measurement instruments are calibrated every two hours at a minimum (Ko and Cho, 2006). HC is calibrated with propane.…”

Section: Remote Sensing Measurementsmentioning

confidence: 99%

“…In many cities, measurement of emissions from vehicles travelling under typical driving conditions is carried out using remote sensing techniques, originally developed by the University of Denver (Stedman and Bishop, 1990;Mazzoleni et al, 2004a;Ko and Cho, 2006). Often such measurements are carried out to identify high-emitting vehicles within the vehicle fleet and thus the effectiveness of vehicle inspection and maintenance programs.…”

Section: Introductionmentioning

confidence: 99%

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Observation of increases in emission from modern vehicles over time in Hong Kong using remote sensing

Lau¹,

Hung²,

Cheung³

2012

Environmental Pollution

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In this study on-road gaseous emissions of vehicles are investigated using remote sensing measurements collected over three different periods. The results show that a high percentage of gaseous pollutants were emitted from a small percentage of vehicles. Liquified Petroleum Gas (LPG) vehicles generally have higher gaseous emissions compared to other vehicles, particularly among higher-emitting vehicles. Vehicles with high vehicle specific power (VSP) tend to have lower CO and HC emissions while petrol and LPG vehicles tend to have higher NO emissions when engine load is high. It can be observed that gaseous emission factors of petrol and LPG vehicles increase greatly within 2 years of being introduced to the vehicle fleet, suggesting that engine and catalyst performance deteriorate rapidly. It can be observed that LPG vehicles have higher levels of gaseous emissions than petrol vehicles, suggesting that proper maintenance of LPG vehicles is essential in reducing gaseous emissions from vehicles.

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Section: Remote Sensing Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Observation of increases in emission from modern vehicles over time in Hong Kong using remote sensing

Lau¹,

Hung²,

Cheung³

2012

Environmental Pollution

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“…This ratio is in agreement with the ratio of corresponding emission rates. Ko and Cho (2006) published their result of a wide traffic emission measurement sequence performed remotely at urban and rural areas. Using their data, a 0.14 NO-to-CO emission ratio can be calculated for urban driving cycle.…”

Section: Nitrogen Oxidesmentioning

confidence: 99%

Investigating the Real Air Pollution Exchange at Urban Sites Based on Time Variation of Columnar Content of the Components

Alföldy

Steib

2011

Water Air Soil Pollut

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As a new approach, urban air pollution was characterised by the variation of columnar content of the pollutants. Columnar content (CC) was estimated as the product of the pollutant's mixing ratio and the mixing height. Mixing ratio data of the Metropolitan Air Quality Monitoring Network of Budapest were used, whilst mixing height was calculated by the meteorological AERMET model code. Time variation of CC refers to the real pollution exchange in the atmosphere that allows direct investigation of the emissions as well as post-emission modifications of the pollutants (such as chemical degradation or production). The diurnal urban CO cycle was found to be determined by two or three main influx peaks according to the traffic pattern of the site. The diurnal variation of NO x level was found to be driven by traffic emission as well. Variant ratios of NO x to CO influxes obtained for the different locations of the city range from 0.12 to 0.23, probably according to the vehicle composition of the traffic. The daily balance of photochemical production, chemical degradation and deposition of ozone yielded negative or positive depending on the location. Negative balances imply that the polluted urban atmosphere is a net ozone neutraliser source. Entrainment from the free troposphere yielded the major contributor to the diurnal ozone level at each site. The diurnal urban PM 10 cycle was found to be determined by traffic emission during the morning and evening rush hours whilst secondary aerosol formation around noon. In the evening, high PM 10 level rise was observed due to direct traffic emission as well as rapid conversion of the fine aerosol fraction to the coarse fraction.

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“…A model-based catalyst converter controller was used in vehicle based testing by Belanovic et al (2006). It was found that using such a Ko and Cho (2006) conducted measurements of vehicle emissions using remote sensing in Taiwan. Type of sampling sites, driving speeds, and vehicle accelerations were found to be dominant factors influencing emissions.…”

Section: Emissionsmentioning

confidence: 99%

Automotive Wastes

Hoeksema¹,

Cheperdak²,

Ikehata³

et al. 2007

Water Environment Research

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Characterization of large fleets of vehicle exhaust emissions in middle Taiwan by remote sensing

Cited by 24 publications

References 13 publications

Observation of increases in emission from modern vehicles over time in Hong Kong using remote sensing

Observation of increases in emission from modern vehicles over time in Hong Kong using remote sensing

Investigating the Real Air Pollution Exchange at Urban Sites Based on Time Variation of Columnar Content of the Components

Automotive Wastes

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