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40 CFR § 52.1127 - Attainment dates for national standards. 

---
identifier: "/us/cfr/t40/s52.1127"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "40 CFR § 52.1127 - Attainment dates for national standards."
title_number: 40
title_name: "Protection of Environment"
section_number: "52.1127"
section_name: "Attainment dates for national standards."
chapter_name: "ENVIRONMENTAL PROTECTION AGENCY"
subchapter_number: "C"
subchapter_name: "AIR PROGRAMS"
part_number: "52"
part_name: "APPROVAL AND PROMULGATION OF IMPLEMENTATION PLANS"
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"
cfr_part: "52"
---

# 52.1127 Attainment dates for national standards.

The following table presents the latest dates by which the national standards are to be attained. The table reflects the new information presented in the approved Massachusetts plan.

|  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- |
| AQCR 42: Hartford-New Haven-Springfield Interstate Area ( 40 CFR 81.26) | (a) | (b) | (a) | (a) | (a) | (c) |
| AQCR 117: Berkshire Intrastat Area ( 40 CFR 81.141) | (a) | (b) | (a) | (a) | (a) | (c) |
| AQCR 118: Central Mass Intrastate Area ( 4r0 CFR 81.142) | (a) | (b) | (a) | (a) | (a) | (d) |
| AQCR 119: Metropolitan Boston Intrastate Area ( 40 CFR 81.19) | (a) | (b) | (a) | (a) | (a) | (d) |
| AQCR 120: Metropolitan Providence Interstate Area ( 40 CFR 81.31) | (a) | (b) | (a) | (a) | (a) | (d) |
| AQCR 121: Merrimack Valley-Southern NH Interstate Area ( 40 CFR 81.81) | (a) | (b) | (a) | (a) | (a) | (d) |
| a. Air quality presently below primary standards or area is unclassifiable. |  |  |  |  |  |  |
| b. Air quality levels presently secondary standards or area is unclassifiable. |  |  |  |  |  |  |
| c. December 31, 2003. |  |  |  |  |  |  |
| d. November 15, 2007. |  |  |  |  |  |  |

[45 FR 61303, Sept. 16, 1980, as amended at 46 FR 33524, June 30, 1981; 66 FR 693, Jan. 3, 2001; 67 FR 7278, Feb. 19, 2002; 67 FR 72579, Dec. 6, 2002]