Statistical Analysis of the Relationship between Traffic Density and NO2 concentration using Environmental Monitoring Data obtained by Diffusive Sampler Method.

概要

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A statistical analysis was carried out to evaluate the relationship between NO2 concentration and traffic density. Environmental monitoring NO2 concentration data were obtained by diffusive sampler method between April, 1989 and March, 1993 at 22 monitoring site in Sendai City. The average monthly NO2 concentration at all the sites ranged from 14.4 ppb to 38.9 ppb (mean, 27.2 ppb) . The annual distribution of monthly adjusted treatment means for NO2 concentration formed a V-shaped curve, with the lowest value observed in August and the highest in March. The pattern of monthly change of NO2 concentration in Sendai City was similar to that reported for areas with high atmospheric NO2 concentration. Analysis of covariance revealed the greatest effect for traffic density. The partial regression coefficient for traffic density was 2.2×10-4 (ppb/vehicle), indicating that an increase of NO2 concentration on the order of 2.2 ppb could be predicted for every traffic density increase of 10, 000 vehicles. The partial regression coefficient for distance to the road was -0.1 ppb/m. Partial regression coefficient for measurement year was significant and showed positive value (0.32 ppb/year) . However, the magnitude of annual increase (1.2%) is low. About 63% of the total observed variance could be accounted for by the mathematical model used in this study.
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