Comprehensive Evaluation of a Low-Profile Cross-Ventilated  Freestall Barn. J. F. Smith, J. P. Harner. Western Dairy Management Conference, Reno, NV March 7-9, 2007本文通过CEREX UV Sentry对Freestall building 排放的气体Ammonia (NH3), Nitric Oxide (NO2), Nitrogen Oxides (NOx), Hydrogen Sulfide (H2S), other reduced Sulfide (S2) compounds, and Volatile Organic Compounds (VOCs).进行了研究。研究结果表明排放的气体以氮基化合物为主。