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Better knowledge of particulate matter (PM) concentrations needs portable, reliable, user friendly, low cost, real time mass analyzers of PM2.5 and PM10. Optical Particle Counters (OPC) measuring mass have manufacturer calibration specific gravity “K” factor referred to polystyrene latex particles which are completely different than those of the real world, therefore they require specific calibrations. Measurements are also subject to Relative Humidity (RH) heavy interference. Objectives To evaluate, within the IMPASHS WP2 Project, the performance of four different OPC’s in Environmental Tobacco Smoke and background urban pollution and to find the new “K” factors using one Model BAM-1020 with certificate n. EPQM0798-122 for comparison. Methodology All instruments have been operating in parallel measuring PM2.5 generated by cigarettes (ETS) indoor and by urban pollution outdoor and the data were replicated three times. Results “K” factors were widely different between manufacturer's model, instrument serial numbers, ETS and urban pollution, ranging from 0.5 to 2.27. Correlation with BAM-1020 was ranging from 0.7500 to 0.9800 and Student t test from 0.3000 to 0.9500. Relative Humidity interference resulted mathematically compensable up to 75 % RH, but above becomes uncontrollable and sample drying becomes compulsory. 180 Conclusion OPC's are very reliable and accurate but need specific calibration and special care in handling and elaboration of the measurements.

epidemiology

Mass Calibration and Relative Humidity Compensation Requirements for Optical Portable Particulate Matter Monitors: The IMPASHS (Impact of Smoke-free Policies in Eu Member States) Wp2 Preliminary Results