For the last few decades, especial attention has been paid to the indoor air quality (IAQ) in apartment building, offices, kindergartens etc. Maintaining indoor air quality in such buildings is very important since people spend most of their time in them. However, such unclassified buildings as military buildings, armouries, police and fire departments are not sufficiently addressed in existing studies. This study focuses on evaluation of indoor air quality and ventilation systems in indoor shooting ranges. Time spent in indoor shooting ranges by visitors is significantly shorter than in offices or apartment buildings consequently minimizing negative health impact. However, accurate definition of necessary air exchange rates and evaluation of indoor air quality will allow to create the most optimal indoor conditions during shooting competitions and to maintain optimal air conditions in staff premises. In scope of this study indoor air quality measurements were done in indoor shooting range in Latvia during shooting competition. The main aim was to define order dependencies on shooting rate and particulate matter concertation. Therefore particle counts in various size ranges was measured. On a basis of existing indoors shooting range a ventilation system was design solutions has been provided and necessary ventilation air volumes as well as heating energy was determined.