Abstract：
:Random forests, an advanced data mining method, are used here to model the regression relationships between concentrations of the pollutants NO2, NOx and PM2.5, and nine variables describing meteorological conditions, temporal conditions and traffic flow. The study was based on hourly values of wind speed, wind direction, temperature, air pressure and relative humidity, temporal variables, and finally traffic flow, in the two years 2015 and 2016. An air quality measurement station was selected on a main road, located a short distance (40 m) from a large intersection equipped with a traffic flow measurement system. Nine different time subsets were defined, based among other things on the climatic conditions in Wrocław. An analysis was made of the fit of models created for those subsets, and of the importance of the predictors. Both the fit and the importance of particular predictors were found to be dependent on season. The best fit was obtained for models created for the six-month warm season (April-September) and for the summer season (June-August). The most important explanatory variable in the models of concentrations of nitrogen oxides was traffic flow, while in the case of PM2.5 the most important were meteorological conditions, in particular temperature, wind speed and wind direction. Temporal variables (except for month in the case of PM2.5) were found to have no significant effect on the concentrations of the studied pollutants.
journal_name
J Environ Managejournal_title
Journal of environmental managementauthors
Kamińska JAdoi
10.1016/j.jenvman.2018.03.094subject
Has Abstractpub_date
2018-07-01 00:00:00pages
164-174eissn
0301-4797issn
1095-8630pii
S0301-4797(18)30327-Xjournal_volume
217pub_type
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