Do you have questions about a Test Method, Performance Specification or Source Category? Find the EMC contact for your question in the EMC Directory.
You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.-
Method 203B Visual Determination of Opacity of Emissions from Stationary Sources for Time-Exception Regulations. 8-4-2017 (PDF)(3 pp, 272 K)
Promulgated CFR Test Method 203B Visual Determination of Opacity of Emissions from Stationary Sources for Time-Exception Regulations.
- Frequently Asked Questions (FAQs) for Method 203B (PDF)(1 pg, 178 K, August 2016)