Understanding EPA Method 9

The Environmental Protection Agency (EPA) Method 9 is a standardized visual technique for determining the opacity of emissions from stationary sources. In simpler terms, it's a method that trained observers use to estimate how much light is blocked by smoke or emissions coming from a facility's stacks.

EPA established this method under 40 CFR Part 60, Appendix A, to provide a consistent, reliable way to measure visible emissions across all industries.

The Certification Requirement

EPA Method 9 readings must be conducted by certified observers. The EPA requires that observers complete a training and certification, commonly called "smoke school," to ensure that opacity readings are consistent, defensible, and acceptable to regulatory agencies.

Smoke school training includes:

  • Classroom or online instruction on the method's principles and procedures
  • Practical training via in-person smoke schools or virtual reality
  • A certification test where candidates must correctly estimate opacity within the accuracy requirements of Method 9
  • Recertification every six months to maintain accuracy

When Do You Need Method 9 Observations?

Your facility likely needs certified Method 9 observers in several situations:

  • Permit compliance monitoring: Many air permits require regular opacity checks
  • Startup and shutdown procedures: Emissions often spike during these periods
  • After equipment maintenance: To verify systems are operating correctly
  • During visible emissions complaints: To document actual conditions
  • Regulatory inspections: Agencies may request on-the-spot readings
  • Performance testing: Often required alongside other emissions measurements

Choosing the Right Opacity Training Program

When selecting a smoke school, look for programs that fit your organization's needs. The newest revolution in smoke school technology uses virtual reality to replace in-person smoke schools. Compliance Assurance offers in-person and virtual reality field training options, plus a self-paced online lecture to ensure your team gets certified efficiently and effectively.

If hands-on, in-person smoke schools are best for your company, ensure the training:

  • Is taught by experienced, certified instructors
  • Uses properly calibrated smoke generators
  • Provides adequate hands-on practice time
  • Provides immediate certification proof and online certification records
  • Includes recertification reminders

Compliance Assurance in-person smoke schools offer digital certification, which is efficient and fast. Students aren't required to wait — for sign-in, grading, or to receive their certification.

Have questions about EPA Method 9 certification or visible emissions compliance? Our team is here to help. Email or call 901-381-9960 to discuss your facility's specific needs.