Skip to main content



Visible Emission Evaluation (VEE) Services


We perform opacity observations in accordance with EPA Method 9 and Method 22 to demonstrate compliance with air permits and NSPS Subpart OOO requirements.












Certified Observers

All evaluations are conducted by personnel certified in EPA Method 9, ensuring observations are legally defensible and technically accurate.










Method 9 & Method 22

We offer both opacity evaluations (Method 9) and visual detection of intermittent emissions (Method 22) to meet different regulatory standards.










Subpart OOO Compliance

Opacity readings are typically required under NSPS Subpart OOO for crushers, screens, conveyors, and transfer points. We provide full documentation for your compliance files.










Observation & Documentation

Our service includes field logs, weather records, site sketches, and photographic support—all packaged in a compliance-ready report.










Need State Requirements?










Schedule a Reading

Contact Us