All 12 months. 2554 (2011) 's-2558 (2015) FromMeasurement of the pollution control Department of the station.All the 13 stations.Northern area Do aSpatial interpolationVarious methods. 9 station. AndValidation. 4 station.
All 12 months of the year from 2554 to 2558 from monitoring stations of PCD , all 13 stations in the North do spatial estimation methods 9. Station and check the validity four stations.