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A special issue of Atmosphere (ISSN 2073-4433). This special issue belongs to the section "Air Quality".

Deadline for manuscript submissions: closed (31 August 2015) | Viewed by 102702

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Dr. Pasquale Avino

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Department of Agricultural, Environmental and Food Sciences, Università degli Studi del Molise, Campobasso, Italy
Interests: liquid chromatography; sample preparation; chromatography; environment high-performance liquid chromatography; climate change; ecology; environmental analysis mass spectrometry; analytical chemistry instrumentation
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Special Issue Information

Dear Colleagues,

Indoor and Outdoor Air Quality is the main issue in Atmospheric Chemistry. In particular, indoor air quality has been considered a fundamental aspect of an integrated approach to air quality evaluation, especially in large urban areas and/or megacities. In 2000, the World Health Organization published the document, “The Right to Healthy Indoor Air,” where the indoor air is recognized as fundamental human right. People spend a lot of time in indoor, e.g., in offices, laboratories, buildings, etc. Consequently, indoor pollution can cause side effects ranging from discomfort to severe sensory consequences on health. Simultaneously, evaluating indoor air quality while performing a proper evaluation of the outdoor air quality is important. Evaluations should account for air pollutant emission controls and the reduction or elimination of some pollutants in fuels. Such evaluations should also identify the maximum permitted concentrations of and significant reductions of certain contaminants in the environment.

A big issue in indoor measurements concerns the sampling procedures. This Special Issue proposes a master protocol for analyzing gaseous and particle pollutants in indoor environments. Further, particular attention will be devoted to both residential and occupational aspects, whereas in outdoor air quality evaluations, strong consideration will be given to studies discussing background (e.g., remote places, rural areas) and urban (e.g., big cities, megacities) measurements (inorganic and/or organic fractions). Papers concerning long-time measurements will be preferred. Papers reporting new methodologies of observation and/or models for interpreting atmospheric pollution (gaseous and/or particulate matter) episodes will also be preferred. Finally, a particular focus will be on the nanoparticles/ultrafine particles in both the (residential and industrial) indoors and outdoors.

Manuscripts on all aspects of Indoor and Outdoor Air Quality are welcome for this Special Issue.

Dr. Pasquale Avino
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

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Published Papers (11 papers)

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273 KiB

Open AccessArticle

An Assessment of Air Pollution Exposure Information for Health Studies

by Frederick W. Lipfert

Atmosphere 2015, 6(11), 1736-1752; https://doi.org/10.3390/atmos6111736 - 6 Nov 2015

Cited by 17 | Viewed by 6186

Abstract

Most studies of air pollution health effects are based on outdoor ambient exposures, mainly because of the availability of population-based data and the need to support emission control programs. However, there is also a large body of literature on indoor air quality that is more relevant to personal exposures. This assessment attempts to merge these two aspects of pollution-related health effects, emphasizing fine particles. However, the basic concepts are applicable to any pollutant. The objectives are to examine sensitivities of epidemiological studies to the inclusion of personal exposure information and to assess the resulting data requirements. Indoor air pollution results from penetration of polluted outdoor air and from various indoor sources, among which environmental tobacco smoke (ETS) is probably the most toxic and pervasive. Adequate data exist on infiltration of outdoor air but less so for indoor sources and effects, all of which have been based on surveys of small samples of individual buildings. Since epidemiology is based on populations, these data must be aggregated using probabilistic methods. Estimates of spatial variation and precision of ambient air quality are also needed. Hypothetical personal exposures in this paper are based on ranges in outdoor air quality, variable infiltration rates, and ranges of indoor source strength. These uncertainties are examined with respect to two types of mortality studies: time series analysis of daily deaths in a given location, and cross-sectional analysis of annual mortality rates among locations. Regressions of simulated mortality on personal exposures, as affected by all of these uncertainties, are used to examine effects on dose-response functions using quasi-Monte Carlo methods. The working hypothesis is that indoor sources are reasonably steady over time and thus applicable only to long-term cross-sectional studies. Uncertainties in exposure attenuate the simulated mortality regression coefficients; correlations between “true” and hypothesized exposures are used to compare their effects. For a given exposure uncertainty level, attenuation of regression coefficients is similar for both types of simulated mortality studies, but since cross-sectional studies involve indoor sources they are more sensitive, to the point where regression coefficients may be driven to zero. The most pressing need for confirming data is the distribution of indoor sources among cities, especially for ETS. Full article

(This article belongs to the Special Issue Indoor and Outdoor Air Quality)

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3797 KiB

Open AccessArticle

Internal Combustion Engines as the Main Source of Ultrafine Particles in Residential Neighborhoods: Field Measurements in the Czech Republic

by Jitka Stolcpartova, Martin Pechout, Lubos Dittrich, Martin Mazac, Michael Fenkl, Kristyna Vrbova, Jakub Ondracek and Michal Vojtisek-Lom

Atmosphere 2015, 6(11), 1714-1735; https://doi.org/10.3390/atmos6111714 - 5 Nov 2015

Cited by 3 | Viewed by 6188

Abstract

Ultrafine particles (UFP, diameter < 100 nm) exposure has already been associated with adverse effects on human health. Spatial distribution of UFP is non-uniform; they concentrate in the vicinity of the source, e.g. traffic, because of their short lifespan. This work investigates spatial distribution of UFP in three areas in the Czech Republic with different traffic load: High traffic (Prague neighborhood—Sporilov), commuter road vicinity (Libeznice), and a small city with only local traffic (Celakovice). Size-resolved measurements of particles in the 5–500 nm range were taken with a particle classifier mounted, along with batteries, GPS and other accessories, on a handcart and pushed around the areas, making one-minute or longer stops at places of interest. Concentrations along main roads were elevated in comparison with places farther from the road; this pattern was observed in all sites, while particle number distributions both close and away from main roads had similar patterns. The absence of larger particles, the relative absence of higher concentrations of particles away from the main roads, and similar number distributions suggest that high particle number concentrations cannot be readily attributed to sources other than internal combustion engines in vehicles and mobile machinery (i.e., mowers and construction machines). Full article

(This article belongs to the Special Issue Indoor and Outdoor Air Quality)

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547 KiB

Open AccessArticle

Exposure Assessment of Allergens and Metals in Settled Dust in French Nursery and Elementary Schools

by Nuno Canha, Corinne Mandin, Olivier Ramalho, Guillaume Wyart, Jacques Ribéron, Claire Dassonville and Mickael Derbez

Atmosphere 2015, 6(11), 1676-1694; https://doi.org/10.3390/atmos6111676 - 5 Nov 2015

Cited by 13 | Viewed by 6047

Abstract

The aim of this study was to characterise the contamination in settled dust in French classrooms and to provide an overview of the influencing factors of dust contamination. Cat, dog and dust mite allergens and metals were measured in 51 classrooms at 17 schools. The concentrations of pet allergens in settled dust were generally low (mean value of 0.1 µg·g⁻¹), with carpeted and rug-covered floors presenting higher dust and cat allergen concentrations. The highest metal loadings in dust were observed for manganese (Mn) and copper (Cu), while the lead (Pb) loadings were lower (16 ± 19 µg·m⁻²) and fell below the French guideline. Higher metal leachability was found for cadmium (Cd), Cu, Pb and strontium (Sr) at values of approximately 80%, which suggest that, in cases of dust ingestion by children, a large proportion should be assimilated through the gastro-intestinal tract. The intra-classroom and intra-school variabilities of the metal concentrations in settled dust were lower than the variability between schools. Classrooms with tiled floors had higher Pb loadings than classrooms with wood or vinyl floors. In addition, wet cleaning less than once a week resulted in greater loadings of Cu and Pb in the settled dust. Lastly, enrichment factors showed that metals in settled dust of classrooms were not only from the contribution of the natural background concentrations in soils. Full article

(This article belongs to the Special Issue Indoor and Outdoor Air Quality)

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652 KiB

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Indoor Air Quality in Naturally Ventilated Italian Classrooms

by Fernanda Carmen Fuoco, Luca Stabile, Giorgio Buonanno, Concepcion Vargas Trassiera, Angelamaria Massimo, Aldo Russi, Mandana Mazaheri, Lidia Morawska and Alexandro Andrade

Atmosphere 2015, 6(11), 1652-1675; https://doi.org/10.3390/atmos6111652 - 2 Nov 2015

Cited by 49 | Viewed by 9552

Abstract

Characterization of indoor air quality in school classrooms is crucial to children’s health and performance. The present study was undertaken to characterize the indoor air quality in six naturally ventilated classrooms of three schools in Cassino (Italy). Indoor particle number, mass, black carbon, CO₂ and radon concentrations, as well as outdoor particle number were measured within school hours during the winter and spring season. The study found the concentrations of indoor particle number were influenced by the concentrations in the outdoors; highest BC values were detected in classrooms during peak traffic time. The effect of different seasons’ airing mode on the indoor air quality was also detected. The ratio between indoor and outdoor particles was of 0.85 ± 0.10 in winter, under airing conditions of short opening window periods, and 1.00 ± 0.15 in spring when the windows were opened for longer periods. This was associated to a higher degree of penetration of outdoor particles due to longer period of window opening. Lower CO₂ levels were found in classrooms in spring (908 ppm) than in winter (2206 ppm). Additionally, a greater reduction in radon concentrations was found in spring. In addition, high PM₁₀ levels were found in classrooms during break time due to re-suspension of coarse particles. Full article

(This article belongs to the Special Issue Indoor and Outdoor Air Quality)

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1132 KiB

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Ultrafine Particles in Residential Indoors and Doses Deposited in the Human Respiratory System

by Maurizio Manigrasso, Ettore Guerriero and Pasquale Avino

Atmosphere 2015, 6(10), 1444-1461; https://doi.org/10.3390/atmos6101444 - 30 Sep 2015

Cited by 24 | Viewed by 6014

Abstract

Indoor aerosol sources may significantly contribute to the daily dose of particles deposited into the human respiratory system. Therefore, it is important to characterize the aerosols deriving from the operations currently performed in an indoor environment and also to estimate the relevant particle respiratory doses. For this aim, aerosols from indoor combustive and non-combustive sources were characterized in terms of aerosol size distributions, and the relevant deposition doses were estimated as a function of time, particle diameter and deposition site in the respiratory system. Ultrafine particles almost entirely made up the doses estimated. The maximum contribution was due to particles deposited in the alveolar region between the 18th and the 21st airway generation. When cooking operations were performed, respiratory doses per unit time were about ten-fold higher than the relevant indoor background dose. Such doses were even higher than those associated with outdoor traffic aerosol. Full article

(This article belongs to the Special Issue Indoor and Outdoor Air Quality)

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1366 KiB

Open AccessArticle

Chemical Composition of Indoor and Outdoor PM_2.5 in Three Schools in the City of Rome

by Luca Tofful and Cinzia Perrino

Atmosphere 2015, 6(10), 1422-1443; https://doi.org/10.3390/atmos6101422 - 30 Sep 2015

Cited by 32 | Viewed by 6282

Abstract

In Italy, children spend up to 30% of their time in school institutions; for this reason, the evaluation of indoor air quality in schools constitutes a necessary step forward in the direction of child health protection. In this study, we investigated the chemical composition of PM_2.5 collected simultaneously indoor and outdoor in three primary schools in Rome. Seasonal variations between winter and spring/summer were evaluated, as well as the role of the main macro-sources of PM (soil, sea, traffic, secondary inorganics and organics). During winter periods, characterized by strong atmospheric stability, the main contributors were organics and combustion products, which accounted for more than 70% of the total mass both indoor and outdoor. Spring/summer period was characterized by very low outdoor concentrations (12 μg/m³ on average) and by a more balanced contribution of organic, traffic and secondary inorganic components. Indoor, the contribution of soil-related species from re-suspension of settled dust and secondary inorganic species from outdoor photochemical reactions became significant. Given that several indoor exceedances of the international air quality standards for PM_2.5 were recorded during the most polluted days, the infiltration of outdoor air, due to the inadequate construction characteristics of the buildings and the absence of automated air filtration systems, seemed to be the main causes of the high PM concentrations measured indoor. Full article

(This article belongs to the Special Issue Indoor and Outdoor Air Quality)

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1999 KiB

Open AccessArticle

Effect of the Standard Nomenclature for Air Pollution (SNAP) Categories on Air Quality over Europe

by Efthimios Tagaris, Rafaella Eleni P. Sotiropoulou, Nikos Gounaris, Spyros Andronopoulos and Diamando Vlachogiannis

Atmosphere 2015, 6(8), 1119-1128; https://doi.org/10.3390/atmos6081119 - 31 Jul 2015

Cited by 20 | Viewed by 6147

Abstract

The contribution of different anthropogenic source-sectors on ozone mixing ratios and PM_2.5 concentrations over Europe is assessed for a summer month (July 2006) using the US Environmental Protection Agency’s (EPA’s) Models-3 framework and the Netherlands Organization for Applied Scientific Research (TNO) anthropogenic emissions for 2006. Anthropogenic emission sources have been classified into 10 different Standard Nomenclature for Air Pollution (SNAP) categories. The road transport category, which is mainly responsible for NO_X emissions, is estimated to have the major impact on Max8hrO₃ mixing ratio suggesting an increase of 6.8% on average over Europe, while locally it is more than 20%. Power generation category is estimated to have the major impact on PM_2.5 concentrations since it is the major source of SO₂ emissions, suggesting an increase of 22.9% on average over Europe, while locally it is more than 60%. Agriculture category is also contributing significantly on PM_2.5 concentrations, since agricultural activities are the major source of NH₃ emissions, suggesting an increased by 16.1% on average over Europe, while in regions with elevated NH₃ emissions the increase is up to 40%. Full article

(This article belongs to the Special Issue Indoor and Outdoor Air Quality)

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3435 KiB

Open AccessArticle

Insights into Indoor/Outdoor PM Concentration Ratios due to Dust Storms in an Arid Region

by Helena Krasnov, Itzhak Katra and Michael D. Friger

Atmosphere 2015, 6(7), 879-890; https://doi.org/10.3390/atmos6070879 - 25 Jun 2015

Cited by 6 | Viewed by 5500

Abstract

Dust storms have impacts on both human and physical environments, associated with an increase in atmospheric particulate matter (PM) concentrations. Most studies on exposure to PM have focused on the outdoor air, while information on indoor pollution, is still lacking. The aim of this study was to examine the impact of desert dust events on PM concentrations in indoor environments. A total of over 200 real time measurements of PM were conducted in houses in the Negev Desert during dust storms. Indoor and outdoor PM concentrations were characterized, as well as the relationships between the two datasets. The findings indicated that atmospheric PM₁₀ concentrations can increase from 20–120 μg·m⁻³ on non-dust days to more than 1500 μg·m⁻³ during dust events. Indoor concentrations can reach as high as 1000 μg·m⁻³. The calculated indoor/outdoor (I/O) PM ratio ranged from 0.79 for low-level storms to 0.58 during stronger events. Indoor PM concentrations were found to be dependent on the dust storm intensity (low, medium, high) and duration with a time lag. The information obtained in this study is critical for assessment of policy interventions to reduce exposure risk and health effects due dust storms. Full article

(This article belongs to the Special Issue Indoor and Outdoor Air Quality)

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1159 KiB

Open AccessArticle

Gaseous Products of Incense Coil Combustion Extracted by Passive Solid Phase Microextraction Samplers

by Wen-Hsi Cheng, Chin-Hsing Lai, Wen-Jiunn Tzeng, Chyn Her and Ya-Han Hsu

Atmosphere 2015, 6(6), 822-833; https://doi.org/10.3390/atmos6060822 - 16 Jun 2015

Cited by 5 | Viewed by 6386

Abstract

Burning incense indoors is a common behavior in Southeast Asia. In this investigation, needle trap samplers (NTS), a novel, green analytical technology is used for sampling gaseous combustion by-products from sandalwood incense coils. To extract indoor volatile organic compounds (VOCs), two NTS are prepared, one using 60–80 mesh and the other using 100–120 mesh divinylbenzene (DVB) particles packed in 22-gauge stainless steel needles. This work compares extraction efficiency of an NTS and that of a commercially available 100 μm polydimethylsiloxane solid phase microextration (PDMS-SPME) fiber sampler. Experimental results indicated that the 100–120 mesh DVB-NTS performed best among all samplers during a 1 h sampling period. The main extracted compounds were toluene, ethylbenzene, propane, chloromethane, 1,3-butadiene, methanol and dichloromethane. The potential use of small badge-sized or pen-sized NTS for the indoor atmosphere and occupational hygiene applications is addressed. Full article

(This article belongs to the Special Issue Indoor and Outdoor Air Quality)

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Review

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763 KiB

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Statistical Modeling Approaches for PM₁₀ Prediction in Urban Areas; A Review of 21st-Century Studies

by Hamid Taheri Shahraiyni and Sahar Sodoudi

Atmosphere 2016, 7(2), 15; https://doi.org/10.3390/atmos7020015 - 26 Jan 2016

Cited by 120 | Viewed by 12270

Abstract

PM₁₀ prediction has attracted special legislative and scientific attention due to its harmful effects on human health. Statistical techniques have the potential for high-accuracy PM₁₀ prediction and accordingly, previous studies on statistical methods for temporal, spatial and spatio-temporal prediction of PM₁₀ are reviewed and discussed in this paper. A review of previous studies demonstrates that Support Vector Machines, Artificial Neural Networks and hybrid techniques show promise for suitable temporal PM₁₀ prediction. A review of the spatial predictions of PM₁₀ shows that the LUR (Land Use Regression) approach has been successfully utilized for spatial prediction of PM₁₀ in urban areas. Of the six introduced approaches for spatio-temporal prediction of PM₁₀, only one approach is suitable for high-resolved prediction (Spatial resolution < 100 m; Temporal resolution ≤ 24 h). In this approach, based upon the LUR modeling method, short-term dynamic input variables are employed as explanatory variables alongside typical non-dynamic input variables in a non-linear modeling procedure. Full article

(This article belongs to the Special Issue Indoor and Outdoor Air Quality)

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445 KiB

Open AccessReview

An Overview of Particulate Matter Measurement Instruments

by Simone Simões Amaral, João Andrade De Carvalho, Jr., Maria Angélica Martins Costa and Cleverson Pinheiro

Atmosphere 2015, 6(9), 1327-1345; https://doi.org/10.3390/atmos6091327 - 9 Sep 2015

Cited by 145 | Viewed by 29983

Abstract

This review article presents an overview of instruments available on the market for measurement of particulate matter. The main instruments and methods of measuring concentration (gravimetric, optical, and microbalance) and size distribution Scanning Mobility Particle Sizer (SMPS), Electrical Low Pressure Impactor (ELPI), and others were described and compared. The aim of this work was to help researchers choose the most suitable equipment to measure particulate matter. When choosing a measuring instrument, a researcher must clearly define the purpose of the study and determine whether it meets the main specifications of the equipment. ELPI and SMPS are the suitable devices for measuring fine particles; the ELPI works in real time. In health-related studies, a Diffusion Charger is the instrument that best characterizes the surface of ultrafine particles. Several methods and different particle measuring instruments should be used to confirm the values obtained during sampling. Full article

(This article belongs to the Special Issue Indoor and Outdoor Air Quality)

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