PART 53 — AMBIENT AIR MONITORING REFERENCE AND EQUIVALENT METHODS [ 40CFR 53 ]PART53 — AMBIENT AIR MONITORING REFERENCE AND EQUIVALENT METHODS[ 40 CFR 53 ]Table of ContentsSubpart A — General Provisions§ 53.1 — Definitions.[ Last FR update: 10/17/2006 ]§ 53.2 — General requirements for areference method determination.[Last FR update: 06/22/2010 ]§ 53.3 — General requirements for anequivalent method determination.[Last FR update: 10/17/2006 ]§ 53.4 — Applications for reference orequivalent method determinations.[Last FR update: 10/17/2006 ]§ 53.5 — Processing of applications.[ Last FR update: 10/17/2006 ]§ 53.6 — Right to witness conduct oftests.§ 53.7 — Testing of methods at theinitiative of the Administrator.§ 53.8 — Designation of reference andequivalent methods.[ Last FRupdate: 06/22/2010 ]§ 53.9 — Conditions of designation.[ Last FR update: 10/17/2006 ]§ 53.10 — Appeal from rejection ofapplication.§ 53.11 — Cancellation of refe...