{"data":{"id":"us-va/9vac5-40-940","jurisdiction":"us-va","citation":"9VAC5-40-940","heading":"Standard for visible emissions","body":"A. The provisions of Article 1 (9VAC5-40-60 et seq.) of this part (Emission Standards for Visible Emissions and Fugitive Dust/Emissions, Rule 4-1) apply except that the provisions in subsection B of this section apply instead of 9VAC5-40-80 A.\n\nB. No owner or other person shall cause or permit to be discharged into the atmosphere from any fuel burning equipment unit any visible emissions which exhibit greater than 20% opacity, except for one, six-minute period in any one hour of not more than 60% opacity.  Failure to meet the requirements of this section because of the presence of water vapor shall not be a violation of this section.","path":["Title 9. Environment","Agency 5. State Air Pollution Control Board","Chapter 40. Existing Stationary Sources","Part II. Emission Standards","Article 8. Emission Standards for Fuel Burning Equipment (Rule 4-8)"],"source_url":"https://law.lis.virginia.gov/admincode/title9/agency5/chapter40/section940/","current_through":"2026 Regular Session (effective July 1, 2026)","vintage":"","retrieved_at":"2026-09-14T04:48:05Z","sha256":"827996391bbba0866da4d781c9d5de41ac1f1f0473e67c1df4611481b9de3701","source_id":"us-va-vac","stale":false,"prev":"us-va/9vac5-40-930","next":"us-va/9vac5-40-950"},"notice":"GroundRules: Original legal text. Not legal advice."}