NH3, NH4+, NO3- og (HNO3+NO3-) 24-timers målinger for filterprøver (gas/aerosol).

Nedbør er indsamlet i perioder på mellem et døgn og en måned. 

Teknisk beskrivelse (engelsk)

Method:

• The particulate matter (NH₄⁺ and NO₃^-) is collected on membrane filters
• The gases (NH₃ and HNO₃) are collected on impregnated filters

Analyses are performed either by ionchromatography or autoanalysator. The filter samples are extracted by ultrapure water. 
Due to the exchange between particulate and gas phase for HNO₃ and NO₃^- only the sum is reported.