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The tapered element oscillating microbalance (TEOM) is one type of continuous ambient particulate matter (PM) monitor. Adsorption and desorption of moisture and semivolatile species may cause positive or negative artifacts in TEOM PM mass measurement. The objective of this field study was to investigate possible uncertainties associated with TEOM measurements in the poultry operation environment. For comparisons of TEOM with filter-based gravimetric method, four instruments (TEOM-PM₁₀, low-volume PM₁₀ sampler, TEOM-PM_2.5, and PM_2.5 speciation sampler) were collocated and tested inside a poultry house for PM_2.5 and PM₁₀ (PM with aerodynamic equivalent diameter ≤2.5 and ≤10 μm, respectively) measurements. Fifteen sets of 24-hr PM₁₀ concentrations and 13 sets of 24-hr PM_2.5 measurements were obtained. Results indicate that compared with filter-based gravimetric method, TEOM gave …