The predictors in the final model were: background NO2-concentration, traffic volume at the nearest road, distance to the nearest main road and residential land use in a 5 km circular buffer.
We used Pearson correlation analysis to explore the relationship between school CO ,PM concentrations, traffic counts, and distance to major roads using SPSS version 12.0.
In addition to predicted concentrations, traffic intensity on the nearest road (vehicles per day), and total traffic load (vehicle-kilometers driven per day) on all major roads within a 100-m buffer, were used as indicators of exposure and analyzed together with modeled NO2 background concentrations.
All the studies based on pollutant estimates tended to show an association with leukemia, except the Danish study (Raaschou-Nielsen et al. 2001), which was based on particularly reliable data estimated by inclusion of measured NO2 and benzene concentrations, traffic patterns, and many other parameters in a model.
A mega event can generate an extraordinarily high concentration of traffic superimposed on urban traffic networks for a few weeks.
The forecast predicted an ever-growing concentration of traffic in the 29 airports identified by the agency as major hubs, which now handle 70 percent of all passenger traffic.
"This could bring a huge concentration of traffic," said Edward D. Ryan, who lives across the street.
The ruling also said the department had not examined whether the increased emissions would significantly affect air quality in areas like Southern California and Texas, which would see a greater concentration of traffic since they are closest to Mexico.
The subsequent extension of railway lines and concentration of traffic in Takamatsu made the city the administrative, economic, and cultural centre of Shikoku.
In this case, the continuity of the road is greatly influenced by the concentration of traffic.
But as cybercrime becomes more sophisticated and widespread, and our lives become increasingly connected, the nature of DDoS has changed: now any concentration of traffic on the network is susceptible, be it chat or VoIP networks, online gaming services or enterprise data centers.
