Altitude-dependent gaseous emissions from freight trucks along the China-Pakistan Economic Corridor in Pakistan  

作　　者：Asad Ali Shaikh Tingkun He Fanyuan Deng Zhenyu Luo Junchao Zhao Zhining Zhang Huan Liu 

机构地区：[1]State Key Joint Laboratory of ESPC,State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex,School of Environment,Tsinghua University,Beijing,100084,China

出　　处：《Environmental Science and Ecotechnology》2023年第2期72-78,共7页环境科学与生态技术（英文）

基　　金：supported by the National Natural Science Foundation of China(grant numbers 41822505 and 42061130213 for H.L.);supported by the Royal Society of the United Kingdom through a Newton Advanced Fellowship(NAF\R1\201166).

摘　　要：Recent increases in emissions from freight transport have caused strong concerns about air quality in Pakistan,following the rapid development of projects related to the China-Pakistan Economic Corridor(CPEC).This study reported the first measurements of on-road truck emissions in Pakistan and investigated their dependence on altitude along CPEC routes.Emissions from 70 trucks were measured on CPEC highways located in Islamabad(540 m above sea level),Sost(2800 m above sea level),and at the Khunjerab Pass(4693 m above sea level).Calculated emission factors for carbon monoxide,hydrocarbons,and nitrogen oxides from heavy-duty trucks in Islamabad were 12.94±1.46,15.21±1.67,and 10.69±1.34 g km^(-1)(95%confidence level),respectively,for pre-Pak-II trucks,and 12.75±2.80,14.24±3.53,and 10.24±2.34 g km^(-1)(95%confidence level),respectively,for Pak-II trucks,representing 2e20 times higher values than the emission standards in Pakistan and India.An altitude increase of approximately 4000 m,with the associated changes in meteorology and fleet characteristics,induced an average increase of 103.6%,86.3%,124.5%,and 133.6%in the emission factors of carbon monoxide,hydrocarbons,nitrogen oxides,and carbon dioxide,respectively.Moreover,on-road emissions along the CPEC were mainly influenced by truck types.This study will support the budget evaluation of transport emissions from the CPEC trade fleet.

关 键 词：Truck emissions High altitude China-Pakistan Economic corridor Emission factors 

分 类 号：X734.2[环境科学与工程—环境工程]