الفهرس 
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Abstract
The aim of this study was to assess the indoor air quality status of Damietta Governorate through the evaluation of particulate matter and its water-soluble portion, heavy metals and bioaerosols in medical and residential sites in Damietta Governorate. Air samples were collected were collected from 15 medical sites and 20 residential apartments located in in Damietta city (urban area), and El-Basarta village (suburban area) in the period from May to August 2021. Physical parameters such as temperature and relative humidity, particulate matter (PM10), water-soluble particulates as nitrate (NO3- ), ammonium (NH4+) and sulfate (SO42-), some of heavy metals as lead, zinc and cadmium and bioaerosols including bacteria and fungi were detected in all indoor air samples and its corresponding outdoor samples. Indoor air in the medical and residential sites in Damietta was influenced by elevated concentrations of the PM10, water soluble particulates, heavy metals and bioaerosols. The medical sites had higher concentrations of the measured pollutants than the residential sites. Indoor air pollutants concentrations were lower than the corresponding outdoor concentrations in both medical and residential sites. The concentrations of the measured parameters in the urban area (Damietta City) were higher than those found in the suburban area. Investigated pollutants in this study had I/O ratio lower than 1 in most sites which means that most of the measured pollutants had an outdoor origin. In conclusion, the study demonstrated the importance of improving the indoor air quality either in residential or medical facilities that insure the wellbeing and comfort conditions either for occupants or patients.