检索结果-内蒙古大学图书馆

Measurement of air exchange rates in different indoor environments using continuous CO_2 sensors

Journal of environmental Sciences 2012年第4期24卷 657-664页

作者： Yan You Can Niu Jian Zhou Yating Liu Zhipeng Bai Jiefeng Zhang Fei He Nan Zhang State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control College of Environmental Sciences and EngineeringNankai UniversityTianjin 300071China Research Center for Eco-Environmental Sciences Chinese Academy of SciencesBeijing 100085China

A new air exchange rate （AER） monitoring method using continuous CO2 sensors was developed and validated through both laboratory experiments and field studies. controlled laboratory simulation tests were conducted in a 1-m3 environmental chamber at different AERs （0.1-10.0 hr-1）. AERs were determined using the decay method based on box model assumptions. Field tests were conducted in classrooms, dormitories, meeting rooms and apartments during 2-5 weekdays using CO2 sensors coupled with data loggers. Indoor temperature, relative humidity （RH）, and CO2 concentrations were continuously monitored while outdoor parameters combined with on-site climate conditions were recorded. Statistical results indicated that good laboratory performance was achieved： duplicate precision was within 10%, and the measured AERs were 90%-120% of the real AERs. Average AERs were 1.22, 1.37, 1.10, 1.91 and 0.73 hr-l in dormitories, air-conditioned classrooms, classrooms with an air circulation cooling system, reading rooms, and meeting rooms, respectively. In an elderly particulate matter exposure study, all the homes had AER values ranging from 0.29 to 3.46 hr-1 in fall, and 0.12 to 1.39 hr-1 in winter with a median AER of 1.15.

关键词： air exchange rate continuous CO2 sensor steady-state method decay method particulate matter indoor-outdoorconcentration relationship

来源：评论

学校读者我要写书评

暂无评论

Insights into measurements of water-soluble ions in PM_(2.5)and their gaseous precursors in Beijing

引用

Journal of environmental Sciences 2021年第4期33卷 123-137页

作者： Jie Su Pusheng Zhao Jing Ding Xiang Du Youjun Dou Institute of Urban Meteorology China Meteorological AdministrationBeijing 100089China State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control College of Environmental Science and EngineeringNankai UniversityTianjin 300071China

To better understand the characteristics and transformation mechanisms of secondary inorganic aerosols,hourly mass concentrations of water-soluble inorganic ions(WSIIs)in PM_(2.5)and their gaseous precursors were measured online from 2016 to 2018 at an urban site in *** and diurnal variations in water-soluble ions and gaseous precursors were discussed and their gas-particle conversion and partitioning were also examined,some related parameters were ***(TNH_(3))Rich was also defined to describe the variations of the excess NH_(3)in different *** addition,a sensitivity test was carried out by using ISORROPIA II to outline the driving factors of gas-particle *** Beijing,the relative contribution of nitrate to PM_(2.5)has increased markedly in recent years,especially under polluted *** the four seasons,only a small portion of NO_(2)in the atmosphere was converted into total nitrate(TNO_(3)),and more than 80%of TNO_(3)occurred in the form of nitrate due to the abundant *** concentration of total ammonia(TNH_(3))was much higher than that required to neutralize acid gases,and most of the TNH_(3)occurred as gaseous NH_(3).The nitrous acid(HONO)concentration was highly correlated with NH_(3)concentration and had increased significantly in Beijing compared with previous *** total chloride(TCl)was the highest in winter,andε(Cl^(-))was more sensitive to variations in the ambient temperature(T)and relative humidity(RH)thanε(NO_(3)^(-)).

关键词： PM_(2.5) Water-soluble ion Gaseous precursor Secondary formation Gas-particle partitioning

来源：评论

学校读者我要写书评

暂无评论

Influence of environmental temperature and relative humidity on photocatalytic oxidation of toluene on activated carbon fibers coated TiO_(2)

引用

Frontiers of environmental Science & Engineering 2008年第2期2卷 224-229页

作者： Ting GUO Zhipeng BAI Can WU Tan ZHU State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control College of Environmental Science and EngineeringNankai UniversityTianjin 300071China

TiO_(2) supported on active carbon fiber(TiO_(2)/ACF),an absorbable photocatalyst,is a new kind of material applied in air *** this paper,the influence of environmental temperature(T)and relative humidity(RH)on the gas-solid adsorption of toluene and the photocatalytic oxidation(PCO)efficiency of adsorbed toluene on TiO_(2)/ACF were studied,and then,the purification capability of TiO_(2)/ACF was *** results showed that although the PCO efficiency increased under high RH and T levels,the amount of adsorption of toluene ***,quantitative analysis results of intermediates indicated that more environmental risk emerged when PCO of toluene was carried out at higher environmental T and RH levels because more toxic intermediates would be accumulated on the TiO_(2)/***,it is significant to control the environmental T and RH conditions in the application of the PCO technique.T 525uC and RH530% is the optimal condition for purifying toluene in our experimental system.

关键词： environmental temperature relative humidity TiO_(2)/ACF photocatalytic oxidation toluene

来源：评论

学校读者我要写书评

暂无评论

air pollutant emissions induced by rural-to-urban migration during China's urbanization(2005-2015)

引用

environmental Science and Ecotechnology 2022年第2期10卷 45-53页

作者： Guang Shi Xi Lu Hongxia Zhang Haotian Zheng Zhonghua Zhang Shi Chen Jia Xing Shuxiao Wang State Key Joint Laboratory of Environment Simulation and Pollution Control and School of Environment Tsinghua UniversityBeijing100084PR China Institute for Carbon Neutrality Tsinghua UniversityBeijing100084PR China Beijing Laboratory of Environmental Frontier Technologies Tsinghua UniversityBeijing100084PR China State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex Beijing100084PR China School of Applied Economics Renmin University of ChinaBeijing100872PR China

As the world's most populous country,China has witnessed rapid urbanization in recent decades,with population migration from rural to urban(RU)regions as the major driving *** to the large gap between rural and urban consumption and investment level,large-scale RU migration impacts air pollutant emissions and creates extra uncertainties for air quality ***,we integrated population migration assessment,an environmentally extended inputeoutput model and structural decomposition analysis to evaluate the NOx,SO2 and primary PM2.5 emissions induced by RU migration during China's urbanization from 2005 to *** results show that RU migration increased air pollutant emissions,while the increases in NOx and SO2 emissions peaked in approximately 2010 at 2.4 Mt and 2.2 Mt,accounting for 9.2%and 8.7%of the national emissions,*** primary PM2.5 emissions induced by RU migration also peaked in approximately 2012 at 0.3 Mt,accounting for 2.8%of the national *** indirect emissions embodied in consumption and investment increased,while household direct emissions *** widening gap between urban and rural investment and consumption exerted a major increasing effect on migration-induced emissions;in contrast,the falling emission intensity contributed the most to the decreasing effect benefitting from end-of-pipe control technology applications as well as improving energy *** peak of air pollutant emissions induced by RU migration indicates that although urbanization currently creates extra environmental pressure in China,it is possible to reconcile urbanization and air quality improvement in the future with updating urbanization and air pollution control policies.

关键词： Urbanization Population migration air pollutant emission reduction Inputeoutput model Structural decomposition analysis

来源：评论

学校读者我要写书评

暂无评论

Low-condensation diesel use contributes to winter haze in cold regions of China

引用

environmental Science and Ecotechnology 2024年第6期22卷 226-232页

作者： Weiwei Song Mengying Wang Yixuan Zhao Yu Bo Wanying Yao Ruihan Chen Xianshi Wang Xiaoyan Wang Chunhui Li Kebin He State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin150090China State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing100084China Institute of Atmospheric Physics Chinese Academy of SciencesBeijing100029China Harbin Ecological and Environmental Monitoring Center Harbin150076China Collaborative Innovation Center for Regional Environmental Quality Beijing100084China State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex Beijing100084China

The application of low-condensation diesel in cold regions with extremely low ambient temperatures(−14 to−29℃)has enabled the operation of diesel ***,it may contribute to heavy haze pollution in cold regions during *** we examine pollutant emissions from low-condensation diesel in *** measure the emissions of elemental carbon(EC),organic carbon(OC),and elements,including heavy metals such as arsenic(As).Our results show that low-condensation diesel increased EC and OC emissions by 2.5 and 2.6 times compared to normal diesel fuel,*** of vehicular sources,including EC,As,lead(Pb),cadmium(Cd),chromium(Cr),nickel(Ni),and manganese(Mn),increased by approximately 20.2-162.5%when using low-condensation *** variation of vehicular source indicators,observed at road site ambient environments revealed the enhancement of PM2.5 pollution by the application of low-condensation diesel in *** findings suggest that−35#diesel,a low-cetane index diesel,may enhance air pollution in winter,according to a dynamometer test conducted in *** raises questions about whether higher emissions are released if−35#diesel is applied to running vehicles in real-world cold ambient environments.

关键词： Low condensation diesel Carbonaceous matterHeavy metal Dynamometer Cold regions

来源：评论

学校读者我要写书评

暂无评论

Strong metal-support interaction (SMSI) in environmental catalysis: Mechanisms, application, regulation strategies, and breakthroughs

引用

environmental Science and Ecotechnology 2024年第6期22卷 7-24页

作者： Fuyuan Qi Jianfei Peng Zilu Liang Jiliang Guo Jiayuan Liu Tiange Fang Hongjun Mao Tianjin Key Laboratory of Urban Transport Emission Research&State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control College of Environmental Science and EngineeringNankai UniversityTianjin300071China

The strong metal-support interaction(SMSI)in supported catalysts plays a dominant role in catalytic degradation,upgrading,and remanufacturing of environmental *** studies have shown that SMSI is crucial in supported catalysts'activity and ***,for redox reactions catalyzed in environmental catalysis,the enhancement mechanism of SMSI-induced oxygen vacancy and electron transfer needs to be ***,the precise control of SMSI interface sites remains to be fully *** we provide a systematic review of SMSI's catalytic mechanisms and control strategies in purifying gaseous pollutants,treating organic wastewater,and valorizing biomass solid *** explore the adsorption and activation mechanisms of SMSI in redox reactions by examining interfacial electron transfer,interfacial oxygen vacancy,and interfacial acidic ***,we develop a precise regulation strategy of SMSI from systematical perspectives of interface effect,crystal facet effect,size effect,guest ion doping,and modification ***,we point out the drawbacks and breakthrough directions for SMSI regulation in environmental catalysis,including partial encapsulation strategy,size optimization strategy,interface oxygen vacancy strategy,and multi-component *** review article provides the potential applications of SMSI and offers guidance for its controlled regulation in environmental catalysis.

关键词： environmental catalysis Metal oxide supported catalysts Strong metal-support interaction(SMSI) Interfacial site regulation Electron transfer

来源：评论

学校读者我要写书评

暂无评论

Local and long-range transport influences on PM_(2.5) at a cities-cluster in northern China,during summer 2008

引用

Particuology 2014年第2期12卷 66-72页

作者： Lijie Gao Yingze Tian Caiyan Zhang Guoliang Shi Huize Hao Fang Zeng Chunli Shi Meigen Zhang Yinchang Feng Xiang Li State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control College of Environmental Science and EngineeringNankai University Institute of Atmospheric Physics Chinese Academy of Sciences Department of Computer Science University of GeorgiaAthensGAUSA

Hourly PM2.5 concentrations were observed simultaneously at a cities-cluster comprising 10 cities/towns in Hebei province in China from July 1 to 31, 2008. Among the 10 cities/towns, Baoding showed the high- est average concentration level （161.57μg/m3） and Yanjiao exhibited the lowest （99.35 μg/m3 ）. These observed data were also studied using the joint potential source contribution function with 24-h and 72-h backward trajectories, to identify more clearly the local and countrywide-scale long-range transport sources. For the local sources, three important influential areas were found, whereas five important influential areas were defined for long-range transport sources. Spatial characteristics of PM2.5 were determined by multivariate statistical analyses. Soil dust, coal combustion, and vehicle emissions might be the potential contributors in these areas. The results of a hierarchical cluster analysis for back trajectory endpoints and PM2.s concentrations datasets show that the spatial characteristics of PM2.5 in the cities-cluster were influenced not only by local sources, but also by long-range transport sources. Different cities in the cities-cluster obtained different weighted contributions from local or long-range transport sources. Cangzhou, Shijiazhuang, and Baoding are near the source areas in the south of Hebei province, whereas Zhuozhou, Yangfang, Yanjiao, Xianghe, and Langfang are close to the sources areas near Beijing and Tianjin.

关键词： Local mtluenceRegional influenceJoint potential source contribution functionHierarchical cluster analysis

来源：评论

学校读者我要写书评

暂无评论

Real world particle size distribution from vehicle fleet and implication on emission control

npj Clean Air

引用

npj Clean air 2025年第1期1卷 1-10页

作者： Fuyang Zhang Jianfei Peng Jinsheng Zhang Jiayuan Liu Yajun Wu Peiji Liu Kexi Liu Bin Sun Qijun Zhang Lin Wu Hongjun Mao Ning Yang Wei Hu Tianjin Key Laboratory of Urban Transport Emission Research & State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control College of Environmental Science and Engineering Nankai University Tianjin China Tianjin Eco-Environmental Monitoring Center Tianjin China Institute of Surface-Earth System Science Tianjin University Tianjin China

Particle size distribution (PSD) of vehicular emissions is crucial for assessing their impacts on air quality and human health. However, real-world PSD data from vehicle fleets is scarce. Here, we conducted a two-week tunnel measurement of PSD from fleet emission. The estimated fleet-average emission factor for particle number (PN) was 2.6 × 1014kg-fuel−1. The PSD of vehicular emission peaked in nucleation mode, indicating a significant role of volatile particles likely formed outside exhaust pipes. Diurnal variations in PN correlated with traffic flow; however, high-emitting diesel vehicles, particularly those from other cities, caused notable spikes in PN and black carbon emissions during off-peak hours. Positive matrix factorization analysis confirms this critical role of high-emitting vehicles and also reveals the dominance of non-exhaust emissions on PM2.5and PM10. This study highlights the importance of stricter regulations on high-emitting vehicles and measures to mitigate nucleation mode and non-exhaust particles.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Quantifying the impacts of emissions and meteorology on the interannual variations of air pollutants in major Chinese cities from 2015 to 2021

引用

Science China Earth Sciences 2023年第8期66卷 1725-1737页

作者： Qili DAI Tianjiao DAI Linlu HOU Linxuan LI Xiaohui BI Yufen ZHANG Yinchang FENG State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control College of Environmental Science and EngineeringNankai UniversityTianjin 300350China China Meteorological Administration-Nankai University Cooperative Laboratory for Atmospheric Environment-Health Research Tianjin 300350China

air pollutant concentration is a function of emission rates and *** accurately evaluate the effect of control measures,the meteorological covariate must be corrected from the *** study quantified the impacts of emission abatement and meteorological condition on the interannual variations of SO_(2),NO_(2),CO,O_(3),PM_(10) and PM_(2.5) concentrations in 31 major Chinese cities using an optimized machine learning-based meteorological normalization ***,the annual average concentrations of SO_(2),NO_(2),CO,PM_(10)and PM_(2.5)were reduced by 86%,51%,99%,86% and 88%from 2015 to 2020,respectively,in the studied cities,attributable to their emission ***,the concentration of O_(3) was found with no significant decrease with the reduction of *** abatement notably improved air quality between 2015 and *** a decline in emissions tended to progressively slow down since ***,the meteorological conditions in 2016–2017 and 2018–2019 were unfavorable for a better air quality,while it became favorable in 2020–***,emission abatement in 2021 further lowered the concentrations of SO_(2),NO_(2),CO,and PM_(2.5),while the emission of PM_(10) *** changes in precursors emissions worsened O_(3) air *** meet the demand of improving air quality,more aggressive abatement measures need to be formulated to synergistically reduce NOx,volatile organic compounds,and coarse particles.

关键词： air pollution air quality Machine learning Meteorology Emissions Policy evaluation

来源：评论

学校读者我要写书评

暂无评论

Evaluation of health benefit using Ben MAP-CE with an integrated scheme of model and monitor data during Guangzhou Asian Games

引用

Journal of environmental Sciences 2016年第4期28卷 9-18页

作者： Dian Ding Yun Zhu Carey Jang Che-Jen Lin Shuxiao Wang Joshua Fu Jian Gao Shuang Deng Junping Xie Xuezhen Qiu Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control College of Environmental and Energy South China University of Technology Guangzhou Higher Education Mega Center Guangzhou 510006 China. State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex Beijing 100084 China USEPA/Office of Air Quality Planning & Standards RTP NC27711 USA Department of Civil Engineering Lamar University Beaumont TX 77710-0024 USA Department of Environmental Science and Engineering Tsinghua University Beijing 100084 China Department of Civil & Environmental Engineering University of Tennessee Knoxville TN 37996-2010 USA Chinese Research Academy of Environmental Sciences Beijing 100012 China

Guangzhou is the capital and largest city（land area：7287 km2）of Guangdong province in South *** air quality in Guangzhou typically worsens in November due to unfavorable meteorological conditions for pollutant *** the Guangzhou Asian Games in November 2010,the Guangzhou government carried out a number of emission control measures that significantly improved the air *** this paper,we estimated the acute health outcome changes related to the air quality improvement during the 2010 Guangzhou Asian Games using a next-generation,fully-integrated assessment system for air quality and health *** advanced system generates air quality data by fusing model and monitoring data instead of using monitoring data alone,which provides more reliable *** air quality estimates retain the spatial distribution of model results while calibrating the value with *** results show that the mean PM2.5concentration in November 2010 decreased by 3.5μg/m^3 compared to that in 2009 due to the emission control *** the analysis,we estimate that the air quality improvement avoided 106 premature deaths,1869 cases of hospital admission,and 20,026 cases of outpatient *** overall cost benefit of the improved air quality is estimated to be 165 million CNY,with the avoided premature death contributing 90%of this *** research demonstrates that Ben MAP-CE is capable of assessing the health and cost benefits of air pollution control for sound policy making.

关键词： air quality Health benefit PM2.5 Ben MAP-CE Data fusion Model and monitor data

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：