Variable
acidity
precipitation_amount
nitrogen_dioxide
sulphate_total_mg_S_per_l
ammonium_mg_N_per_l
pH
susp_part_matter
ammonium_ug_N_per_m3
sulphate_total_ug_S_per_m3
sulphur_dioxide
sulphate_corrected
nitrate
chloride
sodium
calcium
magnesium