What is overnight stack emissions testing?

Overnight stack emissions testing involves monitoring and measuring pollutants released from industrial stacks during nighttime or overnight operations. This process ensures compliance with environmental regulations by capturing data when production may run at different rates or when certain emissions controls might be less closely monitored. Technicians use specialized equipment to sample gases such as sulfur dioxide, nitrogen oxides, and particulate matter. The results help facilities identify emission levels and make necessary adjustments to reduce environmental impact.