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Bioaerosol concentration was measured in wastewater treatment units in south of Tehran, the largest wastewater treatment plant in the Middle East. Active sampling was carried out around four operational units and a point as background. The results showed that the aeration tank with an average of 1016 CFU/m3 in winter and 1973 CFU/m3 in summer had the greatest effect on emission of bacterial bioaerosols...
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