{"data":{"id":"us-va/9vac5-40-6620","jurisdiction":"us-va","citation":"9VAC5-40-6620","heading":"Standard for nitrogen oxides","body":"No owner or other person shall cause or permit to be discharged into the atmosphere from any Class I unit any nitrogen oxide emissions in excess of the following:\n\n1. For mass burn waterwall units: 200 parts per million by dry volume, measured at 7.0% oxygen, 24-hour daily block arithmetic average concentration.\n\n2. For mass burn rotary waterwall units: 170 parts per million by dry volume measured at 7.0% oxygen, 24-hour daily block arithmetic average concentration.\n\n3. For refuse-derived fuel units: 250 parts per million by dry volume, measured at 7.0% oxygen, 24-hour daily block arithmetic average concentration.\n\n4. For fluidized bed units: 220 parts per million by dry volume, measured at 7.0% oxygen, 24-hour daily block arithmetic average concentration.\n\n5. For mass burn refractory units: 350 parts per million by dry volume, measured at 7.0% oxygen, 24-hour daily block arithmetic average concentration.\n\n6. For modular excess air units: 190 parts per million by dry volume, measured at 7.0% oxygen, 24-hour daily block arithmetic average concentration.\n\n7. For modular starved air units: 380 parts per million by dry volume, measured at 7.0% oxygen, 24-hour daily block arithmetic average concentration.","path":["Title 9. Environment","Agency 5. State Air Pollution Control Board","Chapter 40. Existing Stationary Sources","Part II. Emission Standards","Article 46. Emission Standards for Small Municipal Waste Combustors (Rule 4-46)"],"source_url":"https://law.lis.virginia.gov/admincode/title9/agency5/chapter40/section6620/","current_through":"2026 Regular Session (effective July 1, 2026)","vintage":"","retrieved_at":"2026-09-14T04:48:15Z","sha256":"c955368b91ca35189b5f2c3a875d5fdcc76b9974a95c328a9b0c197ccf1a1f73","source_id":"us-va-vac","stale":false,"prev":"us-va/9vac5-40-6610","next":"us-va/9vac5-40-6630"},"notice":"GroundRules: Original legal text. Not legal advice."}