Abstract: The Environmental Institute of Rio de Janeiro State – INEA conducts Continuous and Periodic Monitoring of Fixed Sources in companies across the state of Rio. This involves presenting data on physical and chemical parameters sent by Continuous Emissions Monitoring Systems (CEMS) and data from Periodic Monitoring campaigns conducted by companies participating in the Fixed Source Emissions Monitoring Program for the Atmosphere. CEMS is an integrated system for continuously measuring pollutant concentrations or emission rates. It typically includes a sample measurement probe at specific points in the stack, a pollutant analyzer, a data recording datalogger, and a telemetry system to transmit data to a server. Periodic Monitoring takes place at least every six months, with the group of monitored pollutants varying based on the specifics of each equipment’s process linked to its stack or outlet duct. While CONAMA resolutions 382/2006 and 436/2011 provide guidelines for monitoring pollutants from stationary sources, states have the autonomy to enact more stringent standards. Depending on factors such as the nature of the enterprise, pollutant load, and conduct adjustment terms, companies with higher polluting potential must install equipment for continuous measurement, such as CEMS. Although various types of enterprises undergo monitoring, this study focuses on data from cement plants. The objective of this research is to publish emissions data from three cement plants in the State of Rio de Janeiro and to compare the continuous and periodic monitoring methods. Additionally, the study explores correlations between chemical parameters monitored in the cement plants using a historical series spanning from 2019 to 2023. The analysis includes three cement plants, denoted as Cement Plant 01, Cement Plant 02, and Cement Plant 03. The parameters considered are Sulfur Oxide (SOx) and Particulate Matter (PM). The study found that the strongest correlations were between PM in Cement Plants 01 and 02 (correlation of -32) and Cement Plants 02 and 03 (correlation of 21.9). Regarding SOx and PM, there was a correlation of -20 in Cement Plants 01 and 02. It is important to note that the other parameters showed low correlations. In essence, this study aims to enhance the understanding of continuous and periodic monitoring methods and their correlations.

Keywords: Continuous Emissions Monitoring Systems (CEMS), stack monitoring, air pollution control