Variable
pm10_mass
cobalt
zinc
sodium
selenium
barium
rubidium
antimony
lead
calcium
cerium
nitrate
thorium
strontium
copper
arsenic
chromium
chloride
nickel
potassium
bismuth
lanthanum
magnesium
iron
aluminium
titanium
thallium
uranium
tin
ammonium
cadmium
phosphorus
vanadium
manganese