Heating and ventilation equipment installed in livestock buildings have improved over the last 20 years. Most production facilities have the poroper equipment required to control the building air temperature under extreme weather conditions. But considering that majority of thee systems are strictly controlled by rooom temperature, controlling the air quality in pig barns is still a good challenge. It is generally difficult to achieve a proper control of gas and dust concentrations in real barn conditions because the control strategy used is based on temperature and energy savings rather than air quality.

This paper reviews the most important airbourne contamininats present in a swine building and what should be the maximum concentration for each of these contaminants to ensure worker safety. Some health risks are discussed in the case where those limits are being exceeded. Various options are available to limit contaminant exposure in a barn environment