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An Aerodyne aerosol mass spectrometer (AMS) was deployed at the Pittsburgh Environmental Protection Agency Supersite from 7 to 22 September 2002 as part of the Pittsburgh Air Quality Study (PAQS). The main objectives of this deployment were to characterize the concentrations, size distributions, and temporal variations of nonrefractory (NR) chemical species in submicron particles (approximately PM₁) and to further develop and evaluate the AMS. Reasonably good agreement was observed on particle concentrations, composition, and size distributions between the AMS data and measurements from collocated instruments (given the difference between the PM₁ and PM_2.5 size cuts), including TEOM, semicontinuous sulfate, 2‐hour‐ and 24‐hour‐averaged organic carbon, SMPS, 4‐hour‐averaged ammonium, and micro‐orifice uniform deposit impactor. Total NR‐PM₁ mass concentration in Pittsburgh …