The PAMS samples are collected and analyzed in accordance with 40 CFR 63.658(e)(1)-(2).These regulations prescribe methods for passive absorption sampling in which clean absorbent tubes are deployed and collected every two weeks and sent to a third-party analytical laboratory for analysis.Upon collection of the used sampling tubes, a new set of tubes are deployed to begin sample collection for the next two-week period. Benzene concentration delta [or (Δc)] is reported from the 2-week sample period and is calculated using the minimum and the maximum individual monitoring point sample results.If the 2-week Δc is greater than the applicable Action Threshold, then an investigation is initiated within 24-hours.

Passive Air Monitoring System (PAMS)

Shell Polymers Plant

Shell Polymers is constructing a state-of-the-art plant in Beaver County to provide regional plastic manufacturers.


Over the past 100 years, Shell has continued to help preserve and protect our communities through hundreds of conservation projects and initiatives.  Find out about what Shell is doing locally related to the environment and sustainability.

Fence Line Monitoring (FLM) Program

The Shell Polymers Monaca (SPM) site conducts bi-weekly passive sampling for Chemicals of Potential Concern, which include Benzene, n-Hexane, 1-3 Butadiene, Toluene, and Naphthalene. To conduct this monitoring, Shell has installed twenty (20) Passive Air Monitoring System (PAMS) locations.