Article
Engineering, Chemical
Anni H. Hartikainen, Mika Ihalainen, Pasi Yli-Pirila, Liqing Hao, Miika Kortelainen, Simone M. Pieber, Olli Sippula
Summary: Traffic remains a major source of urban air pollution despite reductions in vehicle emissions. This study investigates the photochemical transformation of exhaust emissions from gasoline and diesel vehicles, finding that vehicle operation significantly affects exhaust composition and secondary aerosol formation potential.
JOURNAL OF AEROSOL SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Jingjing Wang, Md Mahmudun Nabi, Mahdi Erfani, Erfan Goharian, Mohammed Baalousha
Summary: Urban rain and runoff contain various types of anthropogenic nanomaterials, primarily derived from traffic emissions. These anthropogenic nanomaterials may lead to exposure in the atmosphere and potential risks to aquatic organisms.
ENVIRONMENTAL SCIENCE-NANO
(2022)
Article
Chemistry, Multidisciplinary
Michal Puskar, Jozef Zivcak, Stefan Kral, Melichar Kopas, Matus Lavcak
Summary: This study focused on analyzing the influence of experimental diesel fuel mixtures on unregulated gaseous emissions from diesel vehicles. By utilizing a 13-regime engine test cycle, the study provided a comprehensive view on the emissions generation under different operational modes and loading conditions.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Environmental
Katelyn A. Yu, Brian C. McDonald, Robert A. Harley
Summary: Fuel-based NOx emission inventories for California and the US over the period 1990-2020 showed a 70% decline in total on-road NOx emissions, with California leading the reduction by 48% compared to the national decrease. Further efforts have been taken in California to introduce new heavy-duty engines equipped with selective catalytic reduction systems, contributing to the steeper decrease in diesel NOx emissions in the state.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Environmental Sciences
Topi Ronkko, Liisa Pirjola, Panu Karjalainen, Pauli Simonen, Kimmo Teinila, Matthew Bloss, Laura Salo, Arindam Datta, Banwari Lal, Rakesh K. Hooda, Sanna Saarikoski, Hilkka Timonen
Summary: This study aims to address air quality issues in India and emphasizes the importance of monitoring particle number concentrations and black carbon (BC) in urban areas, especially in traffic environments, where people can be significantly exposed to fresh exhaust emissions.
ENVIRONMENTAL POLLUTION
(2023)
Article
Environmental Sciences
Evgenia Ilyinskaya, Emily Mason, Penny E. Wieser, Lacey Holland, Emma J. Liu, Tamsin A. Mather, Marie Edmonds, Rachel C. W. Whitty, Tamar Elias, Patricia A. Nadeau, David Schneider, James B. McQuaid, Sarah E. Allen, Jason Harvey, Clive Oppenheimer, Christoph Kern, David Damby
Summary: Through extensive sampling of Kilauea's 2018 eruption plume, it was found that volatile metal pollutants in basaltic volcanic plumes can be deposited up to 100 times faster than refractory species, potentially producing disproportionate impacts at proximal locations. The relationship between volatility and solubility was identified as an important control on the atmospheric behavior of elements, suggesting that assessment of hazards from volcanic emissions should consider heterogeneous plume depletion of metal pollutants.
COMMUNICATIONS EARTH & ENVIRONMENT
(2021)
Review
Energy & Fuels
Chuanhao Jin, Jiangjun Wei
Summary: In recent years, the search for new clean fuels to replace fossil diesel has become crucial due to the shortage of fossil oil resources and environmental pollution problems. Biodiesel has gained attention for its environmental friendliness, renewable features, and wide range of sources. However, the use of biodiesel often leads to higher NOx emissions. Water, as a fuel additive, can lower the combustion temperature and reduce NOx emissions but also brings new challenges like increased CO and HC emissions. Nanoparticles are expected to address these issues with their higher surface area-to-volume ratio and catalytic properties. Therefore, it is important to investigate the effects of nanoparticles and water on the performance of biodiesel and its blends with diesel.
Article
Energy & Fuels
Ornella Chiavola, Fulvio Palmieri, Domenico Mario Cavallo
Summary: Biodiesel, with its environmentally friendly characteristics, is increasingly used as an alternative to petroleum-derived fuel. However, the use of waste cooking oil biodiesel faces challenges due to high viscosity and low volatility. This study investigates the potential of using aviation fuels in blends with biodiesel to overcome these difficulties, increase the percentage of renewable fuel, and reduce the engine's environmental impact. Experimental tests were conducted on a small diesel engine with different fuels.
Article
Green & Sustainable Science & Technology
Mauricio A. Correa, Santiago A. Franco, Luisa M. Gomez, David Aguiar, Henry A. Colorado
Summary: This research investigated the current methods of characterization of ions and metals in particulate matter pollutants from different emission sources. The Proknow-C methodology was used, with a selection of scientific and review articles. The study examined various methodologies used to quantify ions and metals in PM, focusing on PM10 and PM2.5. The research explored the types of filters, equipment, and characterization techniques. Results showed that Proknow-C is a reliable method for analyzing PM pollution research, providing insight into metals and ions types, characterization technologies, current situations, and trends. Sulfate, nitrate, and ammonium ions accounted for 70-80% of the PM concentrations. Main metals detected included chromium, nickel, lead, cadmium, iron, manganese, coper, and zinc. The predominant detection method was inductively coupled plasma mass spectrometry. Geographic information systems were identified as a valuable tool for integrating spatial data with PM and air pollution analysis, aiding in faster diagnosis and solution implementation.
Article
Environmental Sciences
Nurzawani Md Sofwan, Mohd Talib Latif
Summary: This study aimed to estimate on-road gaseous emission factors of gasoline passenger vehicles under urban Malaysian road traffic conditions, and explored the influence of vehicle characteristics and driving conditions on emission factors through various analysis methods.
ATMOSPHERIC POLLUTION RESEARCH
(2021)
Article
Environmental Sciences
Hiroyuki Yamada, Taichi Kimura, Hidenori Konno, Yoshinori Kondo
Summary: To evaluate the emissions of regulated gases and solid particle number (SPN) in high-load off-cycle conditions, various vehicles were tested. Diesel vehicles with a diesel particulate filter (DPF) and a urea selective catalytic reduction (SCR) system, as well as gasoline port fuel injection (PFI) vehicles, were included in the study. The results showed that all vehicles had higher CO2 emissions in the extra-high (Ex-hi) phase compared to other phases. The DPF vehicle exhibited increased NOx and SPN10-23 emissions due to passive regeneration of the DPF, while the urea SCR system was inactive. The gasoline PFI vehicles showed increased CO and SPN emissions in the Ex-hi phase due to enrichment control during high-load operation.
Article
Thermodynamics
Mohammad Zandie, Hoon Kiat Ng, Suyin Gan, Mohd Farid Muhamad Said, Xinwei Cheng
Summary: In this research, a MIMO-ANN is developed to model the characteristics of diesel-biodiesel-gasoline mixtures and predict engine performance and stability, emissions, combustion and ignition characteristics. By performing sensitivity analysis and outlier detection on the less-effective inputs/data points, accurate predictions are obtained.
Article
Green & Sustainable Science & Technology
Nurul Hanim Razak, Haslenda Hashim, Nor Alafiza Yunus, Jiri Jaromir Klemes
Summary: The study demonstrates that a blend of 70% diesel, 20% biodiesel, and 10% butanol is the optimal choice, providing similar performance to diesel with reduced NOx emissions of 7% to 15% at a lower cost.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Thermodynamics
M. Vergel-Ortega, G. Valencia-Ochoa, J. Duarte-Forero
Summary: This study investigates the use of ethanol as an additive in biodiesel blends derived from palm oil and sunflower oil residues, finding that ethanol incorporation can improve thermal efficiency and reduce emissions levels in diesel engines. Integrating biodiesel and ethanol emerges as a promising alternative for reliable and sustainable operation.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Energy & Fuels
Zhiyuan Hu, Jiale Fu, Xinshun Gao, Piaoqi Lin, Yunhua Zhang, Piqiang Tan, Diming Lou
Summary: By studying the properties of particles emitted from waste cooking oil (WCO) biodiesel and petroleum diesel, it was found that WCO biodiesel particles have higher content of oxygen-containing surface functional groups and carbon atom hybrid ratio, making them easier to be oxidized.
Article
Environmental Sciences
Barouch Giechaskiel, Anastasios Melas, Giorgio Martini, Panagiota Dilara, Leonidas Ntziachristos
Summary: This article discusses the importance of introducing a new metric for effective regulation of vehicle emissions, namely total particles which include solid and volatile particles. It highlights the contribution of road transport to particle number concentration levels in cities and presents emission levels of solid and total particles from modern vehicles. The health effects of solid and volatile particles are briefly discussed. The article also emphasizes the need for an appropriate methodology to achieve representative and reproducible results in monitoring vehicle emissions according to the new metric.
Article
Engineering, Environmental
Vahid Jalali Farahani, Abdulmalik Altuwayjiri, Sina Taghvaee, Constantinos Sioutas
Summary: This study estimated the emission factors of PM10 and its chemical constituents from various sources on two freeways in the Los Angeles basin. The results showed that non-tailpipe emissions, particularly from heavy-duty vehicles on the I-710 freeway, had higher PM10 and metal element emission factors compared to the I-110 freeway. The study also found that road dust resuspension contributed twice as much non-tailpipe PM10 as tire and brake wear.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Green & Sustainable Science & Technology
Barouch Giechaskiel, Fabrizio Forloni, Massimo Carriero, Gianmarco Baldini, Paolo Castellano, Robin Vermeulen, Dimitrios Kontses, Pavlos Fragkiadoulakis, Zissis Samaras, Georgios Fontaras
Summary: Illegal manipulation of vehicles leads to significant increase in emissions, particularly in terms of nitrogen oxides (NOx) and particle numbers. Tampering with the selective catalytic reduction (SCR) and NOx sensor can cause emissions to exceed regulations and reach old or even pre-Euro levels.
Article
Energy & Fuels
Nikolaos Aletras, Stylianos Doulgeris, Zissis Samaras, Leonidas Ntziachristos
Summary: The study compares alternative on-board energy management system (EMS) supervisory control algorithms for plug-in hybrid electric vehicles. The equivalent consumption minimization strategy (ECMS) algorithm leads to lower fuel consumption than the back-engineered commercial rule-based (RB) algorithm in most driving conditions. The difference maximizes at low average speeds (<40 km/h), where the RB algorithm results in more frequent low load engine operation. The ECMS algorithm also demonstrates superior adaptability to different driving cycles.
Review
Thermodynamics
Paivi T. Aakko-Saksa, Kati Lehtoranta, Niina Kuittinen, Anssi Jarvinen, Jukka-Pekka Jalkanen, Kent Johnson, Heejung Jung, Leonidas Ntziachristos, Stephanie Gagne, Chiori Takahashi, Panu Karjalainen, Topi Ronkko, Hilkka Timonen
Summary: The impact of ship emission reductions can be maximized by considering climate, health, and environmental effects simultaneously and using solutions fitting into existing marine engines and infrastructure. Carbon-neutral fuels, including low-carbon and carbon-negative fuels, could resemble current marine fuels and their carbon-neutrality depends on their emissions of greenhouse gases such as CO2, CH4, N2O, and non-gaseous BC emissions. Harmful emissions like NOx, SOx, ammonia, formaldehyde, PM, PN, polyaromatic hydrocarbons (PAHs), and heavy metals need to be removed using fuel, engine, or exhaust aftertreatment technologies. The combination of carbon-neutral drop-in fuels and efficient emission control technologies could enable (near-)zero-emission shipping.
PROGRESS IN ENERGY AND COMBUSTION SCIENCE
(2023)
Article
Environmental Sciences
Mohammad Aldekheel, Abdulmalik Altuwayjiri, Ramin Tohidi, Vahid Jalali Farahani, Constantinos Sioutas
Summary: This study investigated the effectiveness of air purifiers and ventilation systems in reducing indoor air pollution in various classrooms. The results showed that the ventilation systems adequately diluted indoor CO2 concentrations, and the in-line filters and air purifiers efficiently captured particles. This study emphasizes the importance of air purifiers and ventilation systems in reducing indoor air pollution.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH
(2022)
Review
Environmental Sciences
Ilias Vouitsis, Jose Portugal, Anastasios Kontses, Hanna L. Karlsson, Melissa Faria, Karine Elihn, Ana Teresa Juarez-Facio, Fulvio Amato, Benjamin Pina, Zisis Samaras
Summary: Nanoparticle emissions from transport are a major concern due to their high concentration and potential health risks. This paper reviews the different aerosol modes produced by various transport sources, such as road, shipping, aviation, and rail, and investigates their toxicity effects. It concludes that transport sources emit a large number of nanoparticles that can damage the respiratory tract, lungs, and other organs, leading to systemic toxicity.
ATMOSPHERIC ENVIRONMENT
(2023)
Article
Thermodynamics
Nikiforos Zacharof, Orkun Ozener, Stijn Broekaert, Muammer Ozkan, Zissis Samaras, Georgios Fontaras
Summary: Efforts to reduce CO2 emissions from road transport have primarily focused on passenger cars, but there is now a shift in attention towards heavy-duty vehicles, which contribute significantly to greenhouse gas emissions despite their low percentage in the sector. This study investigated the impact of environmental conditions and passenger occupancy on auxiliary usage and CO2 emissions in a bus. Measurements were conducted in Istanbul, Turkey, and vehicle simulation models were developed. The findings revealed variations in auxiliary use and the potential for increased CO2 emissions under different conditions, highlighting the need for further research in this area.
Article
Environmental Sciences
Daniel A. Schwarzkopf, Ronny Petrik, Josefine Hahn, Leonidas Ntziachristos, Volker Matthias, Markus Quante
Summary: Current efforts by the International Maritime Organization (IMO) to decarbonize the shipping sector have gained momentum, but the exact path to achieve this goal is still uncertain. This study developed three ship emission scenarios for the North and Baltic Seas, aiming for a transition to ammonia as the main marine fuel by 2050. Different engine technologies and fuels were considered, with reductions in CO2 and other emissions observed. The estimated NH3 slip from ammonia-fueled ships in the North and Baltic Seas was calculated to be 930 Gg in 2050.
Article
Green & Sustainable Science & Technology
Georgia Voniati, Athanasios Dimaratos, Grigorios Koltsakis, Leonidas Ntziachristos
Summary: This study conducts a preliminary assessment of the emission control challenges of NH3 application as fuel in the maritime sector. By using simulated experiments and physico-chemical models, it provides methods to optimize NOx conversion and minimize NH3 slip, while also pointing out that excess NH3 promotes N2O formation.
Article
Environmental Sciences
Mohammad Aldekheel, Vahid Jalali Farahani, Constantinos Sioutas
Summary: The lifetime cancer risk characterization of ambient PM-bound carcinogenic metals and PAHs was examined in three cities with similar Mediterranean climates but different emission sources and air quality regulations. The study found that Milan had the highest risk, while Los Angeles had the lowest risk. This highlights the importance of local air quality measures in improving air quality and reducing cancer risks.
Article
Thermodynamics
Nikolaos Aletras, Stijn Broekaert, Evangelos Bitsanis, Georgios Fontaras, Zissis Samaras, Leonidas Ntziachristos
Summary: This paper examines the potential fuel consumption savings of implementing a predictive equivalent consumption minimisation strategy in the energy management system of hybrid heavy-duty vehicles. Results show that the proposed algorithm can reduce fuel consumption and save CO2 emissions.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Environmental Sciences
Vahid Jalali Farahani, Abdulmalik Altuwayjiri, Milad Pirhadi, Vishal Verma, Ario Alberto Ruprecht, Evangelia Diapouli, Konstantinos Eleftheriadis, Constantinos Sioutas
Summary: This study examines the impact of urban emission sources on the chemical composition and oxidative potential of ambient particulate matter (PM). The results show that PM samples from different emission sources have distinctive characteristics, with PM from biomass burning and secondary organic aerosols having the highest oxidative potential. In contrast, areas with high metal emissions, such as dust storms, refineries, and industrial areas, exhibit low oxidative potential.
ENVIRONMENTAL SCIENCE-ATMOSPHERES
(2022)