Abstract
Both indoor and outdoor air quality in residential areas of Al Hofuf city/eastern province of Saudi Arabia was studied through a multi-week multiple site measurement and sampling survey. Concentration levels of five criteria air pollutants, including carbon dioxide (CO2), carbon monoxide (CO), nitrous dioxide (NO2), sulfur dioxide (SO2) and total volatile organic compounds (TVOC) were measured and analyzed during the study period from January to May 2014. For this survey, three different location points - including roadside RS, urban UR, and rural RU - were selected. Within each site type, six locations were assigned to carry out air quality measurements and to study varying indoor/outdoor air quality.
Results indicated that a strong correlation between indoor and outdoor air existed. The I/O ratios for the considered criteria pollutants showed that the strongest relationship between indoor and outdoor air was found by carbon dioxide, CO2 in the range of 0.88, while the lowest is found by both NO2 and SO2 in the range of 0.7.