{"data":{"id":"us-va/9vac5-30-56","jurisdiction":"us-va","citation":"9VAC5-30-56","heading":"Ozone (8-hour, 0.075 ppm)","body":"A. The primary and secondary ambient air quality standard is 0.075 parts per million, daily maximum 8-hour average.\n\nB. Ozone shall be measured by the reference method described in Appendix D of 40 CFR Part 50, other method designated as such, or by an equivalent method.\n\nC. The 8-hour primary and secondary ozone ambient air quality standards are met at an ambient air quality monitoring site when the three-year average of the annual fourth-highest daily maximum 8-hour average ozone concentration is less than or equal to 0.075 ppm, as determined in accordance with Appendix P to 40 CFR Part 50.","path":["Title 9. Environment","Agency 5. State Air Pollution Control Board","Chapter 30. Ambient Air Quality Standards"],"source_url":"https://law.lis.virginia.gov/admincode/title9/agency5/chapter30/section56/","current_through":"2026 Regular Session (effective July 1, 2026)","vintage":"","retrieved_at":"2026-09-14T04:48:03Z","sha256":"47603f8ad5dc3a1789d4178fba06f3ac6126cbc37cd533e3926d960584b656d1","source_id":"us-va-vac","stale":false,"prev":"us-va/9vac5-30-55","next":"us-va/9vac5-30-57"},"notice":"GroundRules: Original legal text. Not legal advice."}