Developing a methodology to predict PM10urban concentrations using GLM

A methodology using Generalized Linear Models (GLM) was developed and tested to build a model to predict PM10 outdoor urban concentrations. The methodology is based in the previous study of the relations between atmospheric concentrations of air pollutants CO, NO2, NOx, VOCs, SO2, and meteorological variables, air temperature, relative humidity and wind speed, in a particular city (Barreiro, Portugal). The model uses data from the Portuguese monitoring air quality stations network, and meteorological data. The developed GLM model consider as dependent variable PM10 outside air concentrations, and considers as explanatory independent variables or covariates, the air concentrations of pollutants NO2, NOx, CO, O3 but also the meteorological variables, air temperature, relative humidity of outside air and wind speed. A logarithmic link function was considered with a Poisson probability distribution. Particular attention was dedicated to cases with maximum air temperature below 25oC and maximum air temperature above 25oC. Results indicate that best performance results were achieved for model with values of maximum air temperature above 25oC, when compared with model considering all data, or when compared with model considering maximum air temperature below 25oC. The model was also tested with data from other Portuguese city (Oporto).

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