40 CFR § 60.122a - Standard for particulate matter.

---
identifier: "/us/cfr/t40/s60.122a"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 60.122a - Standard for particulate matter."
title_number: 40
title_name: "Protection of Environment"
section_number: "60.122a"
section_name: "Standard for particulate matter."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "C"
subchapter_name: "AIR PROGRAMS"
part_number: "60"
part_name: "STANDARDS OF PERFORMANCE FOR NEW STATIONARY SOURCES"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "42 U.S.C. 7401"
regulatory_source: "36 FR 24877, Dec. 23, 1971, unless otherwise noted."
cfr_part: "60"
---


# 60.122a Standard for particulate matter.

(a) On and after the date on which the performance test required to be conducted by § 60.8 is completed, no owner or operator subject to the provisions of this subpart shall discharge or cause the discharge into the atmosphere from a blast (cupola) or reverberatory furnace any gases which:

(1) Contain PM in excess of 10 milligrams per dry standard cubic meter, mg/dscm (0.0044 grains per dry standard cubic feet, gr/dscf).

(2) Exhibit opacity greater than 5 percent.

(b) On and after the date on which the performance test required to be conducted by § 60.8 is completed, no owner or operator subject to the provisions of this subpart shall discharge or cause the discharge into the atmosphere from any process fugitive emissions source any gases which:

(1) Contain PM in excess of 4.9 mg/dscm (0.0021 grains per dry standard cubic feet, gr/dscf).

(2) Exhibit opacity greater than 5 percent.

(c) The PM and opacity emissions standards specified in paragraphs (a) and (b) of this section apply at all times, including periods of startup, shutdown, and malfunction.