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0, PM2.5, and CO2 in residential buildings in Alexandria city. The study also determines the indoor and outdoor factors which influence the indoor PM and CO2 concentrations as well as it evaluates the potential indoor sources in the selected homes. This research will help in the development of future indoor air quality standards for Egypt.Background Dysmenorrhea affects most reproductive-aged women. Common dysmenorrhea treatments vary in their effectiveness across individuals. Little is known about factors associated with perceived treat