Related Experiment Videos
Spatial variation in nitrogen dioxide in three European areas
Marie Lewné1, Josef Cyrys, Kees Meliefste
1Occupational and Environmental Health, Norrbacka, SE 171 76 Stockholm, Sweden. marie.lewne@smd.sll.se
The Science of the Total Environment
|September 1, 2004
Summary
Nitrogen dioxide (NO2) spatial variation was assessed across Germany, the Netherlands, and Sweden using diffusion samplers. Local traffic contributed significantly to NO2 levels, especially in the Netherlands and Sweden.
Area of Science:
- Environmental Science
- Air Quality Monitoring
- Atmospheric Chemistry
Background:
- Understanding spatial variations in air pollutants like nitrogen dioxide (NO2) is crucial for targeted environmental management.
- Diffusion samplers offer a cost-effective method for widespread air quality monitoring.
- Previous studies highlight the need for comparative analyses across different European regions.
Purpose of the Study:
- To estimate the spatial variation of nitrogen dioxide (NO2) in Germany, the Netherlands, and Sweden.
- To compare the performance of Palmes tube diffusion samplers with the European reference method (chemiluminescence).
- To assess the contribution of local traffic to NO2 concentrations across different urban and suburban environments.
Main Methods:
- Nitrogen dioxide (NO2) was measured using Palmes tube diffusion samplers at 40-42 sites per country over four 2-week periods annually.
- A reference site in each country was monitored continuously to adjust for seasonal variability and estimate annual averages.
- Palmes tube measurements were compared with the chemiluminescence method (European reference method) to assess accuracy.
Main Results:
- Palmes tubes showed good agreement with the chemiluminescence method in Germany (ratio 1.0) but underestimated NO2 in the Netherlands and Sweden (ratio 0.8).
- Annual average NO2 concentrations varied across sites, with means of 28.8 µg/m³ (Germany), 28.9 µg/m³ (Netherlands), and 18.5 µg/m³ (Sweden).
- Local traffic contributed significantly to NO2 levels in the Netherlands (26-27%) and Sweden (26%), but less so in Germany (9%).
Conclusions:
- Palmes tubes are a reliable tool for assessing spatial NO2 variation, with country-specific calibration adjustments recommended.
- Significant differences in NO2 levels were observed between urban background/suburban sites in Sweden compared to Germany and the Netherlands.
- Local traffic is a major determinant of NO2 concentrations in urban traffic sites, particularly in the Netherlands and Sweden.