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

Lau, Jason; Hung, W.T.; Cheung, Chun Shun

doi:10.1016/j.envpol.2011.12.021

Cited by 27 publications

(28 citation statements)

References 30 publications

(38 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Chan et al used remote sensing to develop CO, HC and NO emission factors for gasoline (Chan et al, 2004), diesel (Chan and Ning, 2005) and liquefied petroleum gas (LPG) (Ning and Chan, 2007) vehicles. Lau et al (2012) used remote sensing to monitor the vehicle emission trends in Hong Kong. It was found that CO, HC and NO emissions [g/km] of gasoline and LPG vehicles were continuously decreasing over the period of 1999, while CO and NO emissions of diesel vehicles increased during 2004.…”

Section: Introductionmentioning

confidence: 99%

Emission measurement of diesel vehicles in Hong Kong through on-road remote sensing: Performance review and identification of high-emitters

Huang

Organ

Zhou

et al. 2018

Environmental Pollution

View full text Add to dashboard Cite

A two-year remote sensing measurement program was carried out in Hong Kong to obtain a large dataset of on-road diesel vehicle emissions. Analysis was performed to evaluate the effect of vehicle manufacture year (1949-2015) and engine size (0.4-20 L) on the emission rates and high-emitters. The results showed that CO emission rates of larger engine size vehicles were higher than those of small vehicles during the study period, while HC and NO were higher before manufacture year 2006 and then became similar levels between manufacture years 2006 and 2015. CO, HC and NO of all vehicles showed an unexpectedly increasing trend during 1998-2004, in particular ≥6001 cc vehicles. However, they all decreased steadily in the last decade (2005-2015), except for NO of ≥6001 cc vehicles during 2013-2015. The distributions of CO and HC emission rates were highly skewed as the dirtiest 10% vehicles emitted much higher emissions than all the other vehicles. Moreover, this skewness became more significant for larger engine size or newer vehicles. The results indicated that remote sensing technology would be very effective to screen the CO and HC high-emitters and thus control the on-road vehicle emissions, but less effective for controlling NO emissions. No clear correlation was observed between the manufacture year and percentage of high-emitters for ≤3000 cc vehicles. However, the percentage of high-emitters decreased with newer manufacture year for larger vehicles. In addition, high-emitters of different pollutants were relatively independent, in particular NO emissions, indicating that high-emitter screening criteria should be defined on a CO-or-HC-or-NO basis, rather than a CO-and-HC-and-NO basis.

show abstract

Section: Introductionmentioning

confidence: 99%

Emission measurement of diesel vehicles in Hong Kong through on-road remote sensing: Performance review and identification of high-emitters

Huang

Organ

Zhou

et al. 2018

Environmental Pollution

View full text Add to dashboard Cite

show abstract

“…On-road remote sensing measurements of gas-phase emissions showed that gasoline vehicles had higher CO and HC emissions and lower NO emissions compared to diesel vehicles, while LPG vehicles overall emitted more gaseous pollutants than their light-duty petrol-and diesel-powered vehicle counterparts (Lau et al, 2012). The higher LPG vehicle emission factors were attributed to the higher usage rate of mostly LPG-powered taxis and light buses combined with insufficient vehicle maintenance, implying a gap between tightened regulations and effectiveness in the reduction of on-road emissions.…”

Section: Background Of Vehicle Emission Studies In Hong Kongmentioning

confidence: 99%

Evaluation of traffic exhaust contributions to ambient carbonaceous submicron particulate matter in an urban roadside environment in Hong Kong

Lee

Louie²,

Luk³

et al. 2017

Atmos. Chem. Phys.

View full text Add to dashboard Cite

Abstract. Road traffic has significant impacts on air quality particularly in densely urbanized and populated areas where vehicle emissions are a major local source of ambient particulate matter. Engine type (i.e., fuel use) significantly impacts the chemical characteristics of tailpipe emission, and thus the distribution of engine types in traffic impacts measured ambient concentrations. This study provides an estimation of the contribution of vehicles powered by different fuels (gasoline, diesel, LPG) to carbonaceous submicron aerosol mass (PM 1 ) based on ambient aerosol mass spectrometer (AMS) and elemental carbon (EC) measurements and vehicle count data in an urban inner city environment in Hong Kong with the aim to gauge the importance of different engine types to particulate matter burdens in a typical urban street canyon. On an average per-vehicle basis, gasoline vehicles emitted 75 and 93 % more organics than diesel and LPG vehicles, respectively, while EC emissions from diesel vehicles were 45 % higher than those from gasoline vehicles. LPG vehicles showed no appreciable contributions to EC and thus overall represented a small contributor to traffic-related primary ambient PM 1 despite their high abundance (∼ 30 %) in the traffic mix. Total carbonaceous particle mass contributions to ambient PM 1 from diesel engines were only marginally higher (∼ 4 %) than those from gasoline engines, which is likely an effect of recently introduced control strategies targeted at commercial vehicles and buses. Overall, gasoline vehicles contributed 1.2 µg m −3 of EC and 1.1 µ m −3 of organics, LPG vehicles 0.6 µg m −3 of organics and diesel vehicles 2.0 µg m −3 of EC and 0.7 µg m −3 of organics to ambient carbonaceous PM 1 .

show abstract

“…Sensing data was combined to obtain underlying surface feature information in Shanghai, and they used infrared gas analyzer to monitor CO 2 concentration belt transect on the ground(Pan et al, 2015) [11] . Remote sensing was used to study exhaust gas emission of vehicles, and the result showed that gasoline cars discharge more CO and HC but less NO than diesel vehicles(Jason et al, 2012) [12] . Vehicle-mounted test means obtaining the instantaneous conditions of the vehicle of the corresponding actual working conditions when running by emission analytical instrument, running state recorder and other relative equipment that are installed in the vehicle.…”

Section: Domestic and Foreign Research Situationsmentioning

confidence: 99%

Research progress on vehicle exhaust emission factor model and dispersion model

Zhang¹,

Qiu²

2016

Proceedings of the 2016 International Conference on Civil, Transportation and Environment

View full text Add to dashboard Cite

Population, economy, resources and environment have received considerable concerns for human beings. A lot of resources are consumed due to demographics and growth prospects, while excessive utilization resources result in environment pollution problems which are intensified the conflict among environment and population, economy and environment on account of the development of industrial production and transportation. A large amount of fossil fuel are consumed by vehicles that exhaust gas emission more than 100 kinds of pollutants such as CO2, CO, NO2, SO2, PM2.5 and so forth, these pollutants aggravate the greenhouse effect and air pollution. The paper reviewed vehicle exhaust emission factor and diffusion model at home and abroad, and summarized the problems existing in the research, and then the scientific outlook were carried on. Proposals were proposed that the research should take on the mountainous area highway which might stay away from the interference of industrial and residential areas. The review not only can help scholars build the high accuracy exhaust emission factor model and dispersion model, but also can provide vehicle pollution control of the foundation of scientific decision-making.

show abstract

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

Cited by 27 publications

References 30 publications

Emission measurement of diesel vehicles in Hong Kong through on-road remote sensing: Performance review and identification of high-emitters

Emission measurement of diesel vehicles in Hong Kong through on-road remote sensing: Performance review and identification of high-emitters

Evaluation of traffic exhaust contributions to ambient carbonaceous submicron particulate matter in an urban roadside environment in Hong Kong

Research progress on vehicle exhaust emission factor model and dispersion model

Contact Info

Product

Resources

About