Pulp and paper mills discharge pollutants to the atmosphere from point sources during the manufacturing processes. Owners and operators of these mills are often required by law to obtain permits to discharge these pollutants. Government issued permits require emissions monitoring of the different point sources in mills to assure protection of human health and the environment. This module describes the most common monitored air emission pollutants in pulp and paper mills and continuous emission monitoring, predictive emission monitoring, and manual stack testing.