By a descriptive study and a design-cross sectional study; author has conducted a study on a real situation of bacterial air pollution and related respiratory diseases in some regions in Thai Nguyen city, the results showed that: 1. The Quan Trieu ward where is bacterial polluted is 3 times higher than a control one. 2. In this ward, a number of bacteria in the afternoon is higher than those in the morning. 3. Bacterial air pollution is related to the prevalence rate of respiratory diseases in the studied regions. From above findings, author has given several recommendations as follows: - In ARI programme, environment factors should be paid more attention to. - Traffic system should be more upgraded. In order to control dust, watering cars should regularyly operate in the main streets of Thai Nguyen city.
Air pollution ; respiratory tract diseases