{"data":{"id":"us-va/9vac5-30-57","jurisdiction":"us-va","citation":"9VAC5-30-57","heading":"Ozone (8-hour, 0.070 ppm)","body":"A. The primary and secondary ambient air quality standard is 0.070 parts per million, daily maximum 8-hour average.\n\nB. Ozone shall be measured by a reference method based on Appendix D to 40 CFR Part 50 and designated in accordance with 40 CFR Part 53 or an equivalent method designated in accordance with 40 CFR Part 53.\n\nC. The primary and secondary ambient air quality standards are met at an ambient air quality monitoring site when the 3-year average of the annual fourth-highest daily maximum 8-hour average ozone concentration is less than or equal to 0.070 ppm, as determined in accordance with Appendix U 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/section57/","current_through":"2026 Regular Session (effective July 1, 2026)","vintage":"","retrieved_at":"2026-09-14T04:48:03Z","sha256":"eaa29a0769271027abe01802ae054a48ac53b50ab7fc589a679fd531c3830114","source_id":"us-va-vac","stale":false,"prev":"us-va/9vac5-30-56","next":"us-va/9vac5-30-60"},"notice":"GroundRules: Original legal text. Not legal advice."}