Volatile organic compounds in rural atmospheres of central Portugal

Cerqueira, Mário; Pio, Casimiro; Gomes, Paula; Matos, José; Nunes, Teresa

doi:10.1016/s0048-9697(03)00250-x

Cited by 55 publications

(23 citation statements)

References 27 publications

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“…This observation is consistent with the fact that photochemical activities are generally stronger on days with more hours of sunlight, which are frequently warmer days, leading to higher production of secondary carbonyl compounds in the atmosphere. [31][32][33] Recent studies conducted in urban areas of Rome, Italy, and at a semirural site in Denmark showed similar seasonal variations in ambient carbonyl concentrations for most of the carbonyl compounds measured in this study, with highest concentrations observed during summer times. 27,34 The exception was formaldehyde in the current study.…”

Section: Resultssupporting

confidence: 81%

Concentrations and Source Characteristics of Airborne Carbonyl Compounds Measured Outside Urban Residences

Liu

Zhang

Kwon

et al. 2006

Journal of the Air & Waste Management Association

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This paper presents the analysis of ambient air concentrations of 10 carbonyl compounds (aldehydes and ketones) measured in the yards of 87 residences in the city of Elizabeth, NJ, throughout 1999NJ, throughout -2001. Most of these residences were measured twice in different seasons; the sampling duration was 48 hr each time. The authors observed higher concentrations for most of the measured carbonyl compounds on warmer days, reflecting larger contributions of photochemical reactions on warmer days. The estimated contributions of photochemical production varied substantially across the measured carbonyl compounds and could be as high as 60%. Photochemical activity, however, resulted in a net loss for formaldehyde. The authors used stepwise multiple linear regression models to evaluate the impact of traffic sources and meteorological conditions on carbonyl concentrations using the data collected on colder days (with lower photochemical activities). They found that the concentrations of formaldehyde, acetaldehyde, acrolein, propionaldehyde, crotonaldehyde, benzaldehyde, glyoxal, and methylglyoxal significantly decreased with increasing distance between a measured residence and one or more major roadways. They also found significant negative associations between concentrations for most of the measured carbonyl compounds and each of the following meteorological parameters: mixing height, wind speed, and precipitation.

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Section: Resultssupporting

confidence: 81%

Concentrations and Source Characteristics of Airborne Carbonyl Compounds Measured Outside Urban Residences

Liu

Zhang

Kwon

et al. 2006

Journal of the Air & Waste Management Association

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“…A possible explanation for the higher concentrations detected in summer could be transport of pollutants from the coast by sea breezes, that are of regular occurrence during summer days. It has been shown, for example, that during summer the air in central Iberian Peninsula contains recirculated pollutants from previous days or emitted from densely populated along coast [6].…”

Section: Resultsmentioning

confidence: 99%

Background atmospheric levels of BTEX in a medium-sized city and surrounding area in Southern Italy

Iovino¹,

Salvestrini²,

Capasso³

2006

WIT Transactions on Ecology and the Environment, Vol 86

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Background atmospheric levels of BTEX in the suburb of Caserta (41° 04' N, 14° 20' E), a Southern Italian city with about 75,000 inhabitants and a low level of industrialization, were measured during weekdays in 2005. The average annual concentrations (µg m -3 ) were 8.7 benzene, 26.0 toluene, 6.5 ethylbenzene, 14.4 (m+p)-xylene and 12.5 o-xylene, with higher values during summer. The average daily concentrations of the different BTEX hydrocarbons were strongly correlated (average correlation coefficients = 0.93). The (m+p)-xylene/ethylbenzene concentration ratio was relatively low (2.2) and did not show statistically significant seasonal variations. In Naples, a densely populated city on the coast, 25 km from Caserta, the ratio was significantly higher (3.3). Intermediate ratios were recorded in sampling sites located between the two cities. The results suggest that BTEX tend to stagnate in Caserta area, producing relatively high levels with low X/E value, or, alternatively, that they are in greater part produced elsewhere, very likely in Naples, and are transported towards Caserta. To discriminate between these two hypotheses analysis of the patters of local winds is in progress.

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“…Glyoxal is very water soluble, and it has an air-seawater partition coefficient, K, of 3.6 × 10 5 M atm − 1 at 25°C . Reported glyoxal concentrations in the atmosphere are 0.025-0.14 ppbv over the remote tropical Pacific Ocean (Sinreich et al, 2010), 0.05-0.6 ppbv in a rural area in Portugal (Cerqueira et al, 2003), 0.13 ppbv in a city in China (Dai et al, 2012), and 0.07 ppbv in a suburban area in Japan (Ortiz et al, 2006(Ortiz et al, , 2009. Atmospheric glyoxal is primarily produced by oxidation of biogenic and anthropogenic volatile organic compounds (Volkamer et al, 2001;Vrekoussis et al, 2009;Sinreich et al, 2010).…”

Section: Tablementioning

confidence: 99%

Spatial distributions of and diurnal variations in low molecular weight carbonyl compounds in coastal seawater, and the controlling factors

Takeda

Katoh

Mitsui

et al. 2014

Science of The Total Environment

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Volatile organic compounds in rural atmospheres of central Portugal

Cited by 55 publications

References 27 publications

Concentrations and Source Characteristics of Airborne Carbonyl Compounds Measured Outside Urban Residences

Concentrations and Source Characteristics of Airborne Carbonyl Compounds Measured Outside Urban Residences

Background atmospheric levels of BTEX in a medium-sized city and surrounding area in Southern Italy

Spatial distributions of and diurnal variations in low molecular weight carbonyl compounds in coastal seawater, and the controlling factors

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