Air quality measurements in urban green areas – a case study
Introduction
Changes in the composition of the urban atmosphere are caused largely by traffic-induced pollutants (Gorissen, 1990). These are mainly carbon monoxide (CO), nitrogen monoxide (NO), dust and soot as well as various types of non-methane hydrocarbons (NMHC), in particular benzene, toluene and xylene. Secondary trace gases which can be formed from these precursor substances in certain photochemical reaction conditions include nitrogen dioxide (NO2), ozone (O3) and other photooxidants, e.g., peroxiacetylnitrate (PAN).
The main centre of interest to date has been the distribution of traffic-induced trace gases directly at the roadside (e.g., Harrop et al., 1990; Kuhler et al., 1990; Laxen and Noordally, 1987; Bringfeld, 1987); less attention has been paid to analysing the air quality of urban areas with various types of land use and their interactions with high spatial resolution (Kuttler, 1996). This applies especially to the air hygiene situation in inner city green areas. It is well known that green areas have a significant recreational function for city-dwellers (Givoni, 1991; Horbert and Kirchgeorg, 1982). To date, only very little work has been done on the air quality of urban green areas near to roads. For example, an early publication (Wainwright and Wilson, 1962) describes SO2 horizontal concentration profiles in Hyde Park, London. PAH concentrations in the Tivoli Park, Copenhagen, are dealt with by Nielsen et al. (1996) and NO, NO2, O3, SO2 and CO concentrations in the Englischer Garten park in Munich are investigated by Mayer and Haustein (1994) on the basis of measurement trips.
This article analyses the extent to which busy roads influence the air quality of neighbouring urban green areas. The objective of the investigation was a worst-case analysis of the air hygiene situation of urban green areas during low-exchange high-radiation summer and winter weather conditions with a view to assessing typical diurnal concentration courses of CO, NO, NO2 and O3. The investigation was carried out in Essen (630 000 inhabitants, 210 km2), Germany, a city situated in the centre of the Rhine-Ruhr area, one of Europe's largest and most densely populated industrial agglomerations.
Section snippets
Experimental set up
Air hygiene and meteorological parameters were measured with a mobile laboratory during mainly calm and clear weather conditions between February 1995 and March 1996. The atmospheric pollutants CO, NO, NO2 and O3 were continuously recorded (4 m a.g.l.) by analysers using the following measuring methods:The meteorological measurements made were wind velocity and wind direction (10 m a.g.l.),
Spatial air hygiene structure in different urban land-use types
Mobile air hygiene profile measurements were made to assess the air hygiene situation of urban green spaces within the overall situation of inner city pollutant concentrations. The measurements were made in a similar way to those reported by Luria et al. (1990) and Mayer et al. (1994). North–south trips (50 km, 6 trips) and west–east trips (60 km, 6 trips) were made in the city of Essen (Fig. 1 (a)) between 22.02.1995 and 12.10.1995. Concentrations were recorded at a sampling rate of 1 s−1. The
Conclusions
The investigations found similar patterns for the trace substances NO and NO2 to those reported by Mayer and Haustein (1994) for Munich, Germany. Unfortunately, the comprehensive results of Mayer and Haustein are not directly comparable with the results of this study as they are based on evaluation procedures not in accordance with the measurement methods used and must therefore be regarded critically. However, in low-emission areas of the city, Mayer and Haustein found O3 concentrations
Acknowledgements
This work was supported by the Forschungsvereinigung Automobiltechnik e. V. (FAT), Frankfurt/Main within the framework of the project “Analysis of automobile caused air pollutants in inner urban traffic and green areas”. The authors wish to thank A. Schmidt (laboratory technician) and R. Zimmermann (technical assistant) for their effective help with the field experiments.
References (25)
- et al.
Local aspects of vehicular pollution
Atmospheric Environment
(1997) - et al.
Hydrocarbon emissions from twelve urban shade trees of the Los Angeles
California, Air Basin. Atmospheric Environment
(1992) Impact of planted areas on urban environment qualitya review
Atmospheric Environment
(1991)- et al.
Air quality in the vicinity of urban roads
Science of the Total Environment
(1990) - et al.
Climatic and air-hygienic aspects in the planning of inner-city open spaces – Berlin Großer Tiergarten
Energy and Buildings
(1982) - et al.
Atmospheric transport of emissions from a motorway – measurement and modelling
Science of the Total Environment
(1990) - et al.
Nitrogen dioxide distribution in street canyons
Atmospheric Environment
(1987) - et al.
CO and NOx levels at the center of city roads in Jerusalem
Atmospheric Environment
(1990) - et al.
City air pollution of polycyclic aromatic hydrocarbons and other mutagensoccurrence, sources and health effects
Science of the Total Environment
(1996) - Barlag, A.-B., Kuttler, W., 1990/1991. The significance of country breezes for urban planning. Energy and Buildings...
Particle concentration model in a small town street based on receptor studies
Journal of Aerosol Science
Deviations from the O3–NO–NO2–photostationary state in tropospheric chemistry
Canadian Journal of Chemistry
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