{"data":{"id":"us-va/9vac5-70-20","jurisdiction":"us-va","citation":"9VAC5-70-20","heading":"Definitions","body":"A. For the purpose of these regulations and subsequent amendments or any orders issued by the board, the words or terms shall have the meanings given them in subsection C of this section.\n\nB. As used in this chapter, all terms not defined here shall have the meanings given them in 9VAC5 Chapter 10 (9VAC5-10-10 et seq.), unless otherwise required by context.\n\nC. Terms defined.\n\n\"Air pollution episode\" means a situation which is declared by responsible authorities as set forth in this chapter when weather or air pollution conditions or both indicate a potential threat to human health.\n\n\"Soiling index\" means a measure of the soiling properties of suspended particles in air determined by drawing a measured volume of air through a known area of Whatman No. 4 filter paper for a measured period of time (normally two hours) expressed by COH's/1000 linear feet.","path":["Title 9. Environment","Agency 5. State Air Pollution Control Board","Chapter 70. Air Pollution Episode Prevention"],"source_url":"https://law.lis.virginia.gov/admincode/title9/agency5/chapter70/section20/","current_through":"2026 Regular Session (effective July 1, 2026)","vintage":"","retrieved_at":"2026-09-14T04:48:31Z","sha256":"4e1ca5f5253aa2eb3365b4115e57d8ef553bbfecba4b3db5767b10d603c650d6","source_id":"us-va-vac","stale":false,"prev":"us-va/9vac5-70-10","next":"us-va/9vac5-70-30"},"notice":"GroundRules: Original legal text. Not legal advice."}