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Simultaneous 24 hour measurements of the concentration of key aerosol species like sulphate, ammonium and nitrate together with sulphur dioxide, conducted by NILU are

Sulphur dioxide emissions for Northern Asia has been estimated one the basis of fossil fuel combustion figures and other available information.2. TABLE

This paper reports the results of a field comparison with three sampling and analysis systems for nitrogen dioxide in urban air; a NO/NO,-monitor and the iodide method in

Sum of nitric acid and nitrate SI08 Teflon filter, Pall Zefluor 2 m + KOH impregnated Whatman 40 filter, 17-23 m3/day Daily Ion chromatography Sum of ammonia and ammonium SI08

Sum of nitric acid and nitrate All NaF impregnated Whatman 40 filter, 3.5-4.2 m 3 /day Daily Spectrophotometric, Griess after hydrazine reduction Sum of ammonia and ammonium All

Sum of nitric acid and nitrate All NaF impregnated Whatman 40 filter, 3.5-4.2 m 3 /day Daily Spectrophotometric, Griess after hydrazine reduction Sum of ammonia and ammonium All

LRTAP ground sampling stations - yearly precipitation and meari concentration values, frequency distributions of sulphur dioxide and sulphate air

Figure 3.3: Monthly volume weighted mean concentrations (left) and wet deposition (right) of sea salt corrected sulphate (top) nitrate (middle), ammonium (bottom) in different parts