Variable
organic_carbon_1
sulphate_total_0
sulphate_total_1
sulphate_corrected_1
pm10_mass
chloride_1
chloride_0
potassium_1
potassium_0
organic_carbon_0
sodium_0
calcium_0
calcium_1
sulphate_corrected_0
pm25_mass
magnesium_0
nitrate_1
nitrate_0
ammonium_0
ammonium_1
sodium_1
elemental_carbon_0
elemental_carbon_1
magnesium_1