The Sigma Group

The Sigma Group

Air Emissions Management & Permitting


Industrial Air Quality encompasses more than the outdoor emissions from your facility. The indoor air quality at your facility affects your employees also. Sigma specializes in the design and application of equipment to solve your indoor and outdoor industrial air quality problems. Sigma has assisted numerous Clients with stack testing, opacity testing, developing emission inventories, obtaining air permits and calculating actual and potential emissions.

Outdoor Air Quality

Outdoor air quality services provided by Sigma include:

  • Ambient and emission monitoring
  • Air emission inventory
  • Air toxics quantification
  • Compliance management
  • Control Technology Analysis
  • Emission control evaluation and design
  • Emission evaluation/compliance determination
  • Indoor air quality
  • Permit application development including:
    • Construction and operating
    • New source review
    • Title V permits
    • Registration permits
  • Permit strategy
  • Risk management plan
  • Source characterization and mapping
  • Visible emissions evaluation

Indoor Air Quality

Sigma’s services consist of monitoring and designing controls for the following contaminants:

  • Asbestos & silica
  • Biological agents (mold, bacteria)
  • CO & CO2
  • Heavy metals
  • Noxious odors
  • Oil mists
  • Particulate matter
  • PCBs
  • Radon
  • SVOCs, VOCs, methane
  • Temperature & relative humidity
  • Other process exposures

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