The most typical air pollutants including PM10, CO, SO2, NOx are monitored at different sites indoor (basement, shopping malls) and outdoor (ambient air) of several complex buildings which are used for different purposes of resident, office, and shopping malls in Hanoi. The results show that the indoor air pollution concentrations tend to be higher than the corresponding pollutants of the ambient air. The results show the highest concentrations are in RC building for the same category of floor comparing to the other two buildings. Pollutant concentrations at basement for parking is the highest with the values of PM10, SO2, NOx, CO of 67.1 ± 21.2 µg/m3, 224.8 ± 34.9 µg/m3, 287.3 ± 136.3 µg/m3, 22,372.5 ± 2,324.5 µg/m3, respectively. The high concentration of indoor air pollutants are harmful for human health, especially for those who have longer exposure time.