35 documents found, page 1 of 4
School air quality and thermal comfort: a multi-pollutant seasonal assessment
Charres, Isabella; Furst, Leonardo; Furst, Leonardo; Vicente, Estela D.; Soares, Marlene; Viegas, Carla; Cervantes, Renata; Cerqueira, MárioAs evidence of children's vulnerability to air pollution grows, research on school air quality has increased significantly in the 21st century. Given the complex factors influencing indoor and outdoor air quality in schools, each study offers valuable insights. This study contributes by assessing particulate matter, gaseous pollutants, thermal comfort and microorganisms in a large school encompassing different ...
Annual and seasonal variability of greenhouse gases fluxes over coastal urban a...
Salgueiro, Vanda; Cerqueira, Mário; Monteiro, Alexandra; Alves, Célia; Rafael, Sandra; Borrego, Carlos; Pio, CasimiroFluxes of CO2, H2O and energy were measured continuously during a four-year period by eddy covariance, simultaneously at an urban and a suburban sites in the western coast of Portugal. The parallel measurements permitted to distinguish anthropogenic from natural CO2 emission/deposition. Natural CO2 fluxes were important in the suburban location. Anthropogenic emission of CO2 dominated the urban fluxes, being th...
Particle-bound polycyclic aromatic hydrocarbons in a rural background atmospher...
Matos, João; Silveira, Carlos; Cerqueira, MárioPolycyclic aromatic hydrocarbons (PAHs) are a group of organic pollutants widely distributed in the atmosphere and well known for their carcinogenic and mutagenic properties. Over the last two decades, research about atmospheric PAHs has been focused in urban and industrial areas, while less attention has been given to rural areas. This study aims to contribute to filling this gap by analyzing the levels, sourc...
Air quality and particulate matter speciation in a beauty salon and surrounding...
Evtyugina, Margarita; Vicente, Estela D.; Vicente, Ana M.; Nunes, Teresa; Lucarelli, Franco; Calzolai, Giulia; Nava, Silvia; Blanco-Alegre, CarlosBeauty salons are considered occupational environments where the staff personnel and clients are exposed to high levels of airborne pollutants. In this study, air quality monitoring was carried out in L ́eon, Spain. Tem- perature, relative humidity, CO2, CO and particulate matter were continuously monitored inside and outside areas of the salon. PM10 was simultaneously collected onto filters. Volatile organic c...
An easy method for processing and identification of natural and synthetic micro...
Prata, Joana C.; Castro, Joana L.; da Costa, João P.; Duarte, Armando C.; Cerqueira, Mário; Rocha-Santos, TeresaMicroplastics and microfibers can contaminate every matrix, including in the atmosphere, thus leading to incidental inhalation. However, concentrations of airborne synthetic particle in indoor and outdoor environments are not well understood due to the complexities of sampling, sample processing and identification. This work aims at producing a simple protocol to determine the concentrations of airborne micropl...
Volatile organic compounds emitted by the stacks of restaurants
Alves, Célia A.; Evtyugina, Margarita; Cerqueira, Mário; Nunes, Teresa; Duarte, Márcio; Vicente, EstelaVolatile organic compound (VOC) samples were collected from the exhaust stacks on the roofs of a university canteen, a charcoal-grilled chicken restaurant and a woodoven roasted piglet restaurant on sorbent tubes with Carbopack B and C packing and analysed by thermal desorption-gas chromatography-flame ionisation detection. Concurrent sampling of carbonyls was also conducted using 2,4-dinitrophenylhydrazine car...
Elements and polycyclic aromatic hydrocarbons in exhaust particles emitted by l...
Alves, Célia A.; Barbosa, Cátia; Rocha, Sónia; Calvo, Ana; Nunes, Teresa; Cerqueira, Mário; Pio, Casimiro; Karanasiou, Angeliki; Querol, XavierThe main purpose of this work was to evaluate the chemical composition of particulate matter (PM) emitted by eight different light-duty vehicles. Exhaust samples from petrol and diesel cars (Euro 3 to Euro 5) were collected in a chassis dynamometer facility. To simulate the real-world driving conditions, three ARTEMIS cycles were followed: road, to simulate a fluid traffic flow and urban with hot and cold start...
Wet deposition of fossil and non-fossil derived particulate carbon: insights fr...
Zhang, Yan-Lin; Cerqueira, Mário; Salazar, Gary; Zotter, Peter; Hueglin, Christoph; Zellweger, Claudia; Pio, Casimiro; Prévôt, André S. H.Radiocarbon (14C) measurements of both organic carbon (OC) and elemental carbon (EC) allow a more detailed source apportionment, leading to a full and unambiguous distinction and quantification of the contributions from non-fossil and fossil sources. A thermal-optical method with a commercial OC/EC analyzer to isolate water-insoluble OC (WIOC) and EC for their subsequent 14C measurement was applied for the firs...
The application of a multi-wavelength Aethalometer to estimate iron dust and bl...
Fialho, Paulo; Cerqueira, Mário; Pio, Casimiro; Cardoso, João; Nunes, Teresa; Custódio, Danilo; Alves, Célia A.; Almeida, S. M.; Almeida-Silva, M.The two-component model (Fialho et al., 2006) was used to decouple the contributions of black carbon (BC) and iron oxides, present in dust, to the aerosol attenuation coefficient, measured with a multiwavelength Aethalometer. The model results were compared with the elemental carbon (EC) and iron concentrations determined in the laboratory from the analysis of aerosol particles collected with conventional sampl...
Wet deposition of particulate carbon to the Central North Atlantic Ocean
Custódio, Danilo; Cerqueira, Mário; Fialho, Paulo; Nunes, Teresa; Pio, Casimiro; Henriques, DiamantinoElemental carbon (EC) and water-insoluble organic carbon (WIOC) concentrations were measured in wet-only precipitation samples collected on Terceira Island (Azores, Portugal) between December 2009 and October 2010, to investigate temporal variations, source regions and wet deposition fluxes. The global volume-weighted average (vwa) concentrations were 134 ± 19 μgC L(-1) for WIOC and 15.0 ± 1.6 μgC L(-1) for EC,...