Several collocated semicontinuous instruments measuring particulate matter with particle sizes Յ2.5 m (PM 2 Results of the intercomparisons of the semicontinuous measurements are presented, as are results of the comparisons between the semicontinuous and timeintegrated filter-based measurements. The comparisons at both sites, in most cases, indicated similar performance characteristics. In addition, charge balance calculations, based on major soluble ionic components of atmospheric aerosol from the PILS-IC and the filter measurements, indicated slightly acidic aerosol at both locations..

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