The indoor air quality (IAQ) as assessed by PM2.5 (particulate matter with an aerodynamic diameter of
less than 2.5 mm) was measured at indoor settings in various residential houses which were located in
different local environments across Kuwait. The indoor house settings included kitchen, living room, and
bedrooms. Samples were collected from houses over 24 h. PM2.5 was estimated using a Dust-Trak
personal sampler. Results were analyzed and compared with the US Environmental Protection
Agencies (EPA) and World Health Organization (WHO) standards and guidelines. The results demonstrated
that kitchens have the highest PM2.5 concentration probably due to cooking activities; the
bedroom has the lowest PM2.5 concentration. The study shows that Kuwait indoor residential pollution is
among the worst in comparison with other countries.