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Appendix to Subpart HH of Part 63—Tables

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Last updated2026-04-27

Appendix to Subpart HH of Part 63—Tables

Table 1 to Subpart HH of Part 63—List of Hazardous Air Pollutants for Subpart HH

CAS Number aChemical name
75070Acetaldehyde
71432Benzene (includes benzene in gasoline)
75150Carbon disulfide
463581Carbonyl sulfide
100414Ethyl benzene
107211Ethylene glycol
50000Formaldehyde
110543n-Hexane
91203Naphthalene
108883Toluene
5408412,2,4-Trimethylpentane
1330207Xylenes (isomers and mixture)
95476o-Xylene
108383m-Xylene
106423p-Xylene
a CAS numbers refer to the Chemical Abstracts Services registry number assigned to specific compounds, isomers, or mixtures of compounds.

Table 2 to Subpart HH of Part 63—Applicability of 40 CFR Part 63 General Provisions to Subpart HH

General provisions referenceApplicable to subpart HHExplanation
§ 63.1(a)(1)Yes.
§ 63.1(a)(2)Yes.
§ 63.1(a)(3)Yes.
§ 63.1(a)(4)Yes.
§ 63.1(a)(5)NoSection reserved.
§ 63.1(a)(6)Yes.
§ 63.1(a)(7) through (a)(9)NoSection reserved.
§ 63.1(a)(10)Yes.
§ 63.1(a)(11)Yes.
§ 63.1(a)(12)Yes.
§ 63.1(b)(1)NoSubpart HH specifies applicability.
§ 63.1(b)(2)NoSection reserved.
§ 63.1(b)(3)Yes.
§ 63.1(c)(1)NoSubpart HH specifies applicability.
§ 63.1(c)(2)YesSubpart HH exempts area sources from the requirement to obtain a Title V permit unless otherwise required by law as specified in § 63.760(h).
§ 63.1(c)(3) and (c)(4)NoSection reserved.
§ 63.1(c)(5)Yes.
§ 63.1(c)(6)Yes
§ 63.1(d)NoSection reserved.
§ 63.1(e)Yes.
§ 63.2YesExcept definition of major source is unique for this source category and there are additional definitions in subpart HH.
§ 63.3(a) through (c)Yes.
§ 63.4(a)(1) through (a)(2)Yes.
§ 63.4(a)(3) through (a)(5)NoSection reserved.
§ 63.4(b)Yes.
§ 63.4(c)Yes.
§ 63.5(a)(1)Yes.
§ 63.5(a)(2)Yes.
§ 63.5(b)(1)Yes.
§ 63.5(b)(2)NoSection reserved.
§ 63.5(b)(3)Yes.
§ 63.5(b)(4)Yes.
§ 63.5(b)(5)NoSection Reserved.
§ 63.5(b)(6)Yes.
§ 63.5(c)NoSection reserved.
§ 63.5(d)(1)Yes.
§ 63.5(d)(2)Yes.
§ 63.5(d)(3)Yes.
§ 63.5(d)(4)Yes.
§ 63.5(e)Yes.
§ 63.5(f)(1)Yes.
§ 63.5(f)(2)Yes.
§ 63.6(a)Yes.
§ 63.6(b)(1)Yes.
§ 63.6(b)(2)Yes.
§ 63.6(b)(3)Yes.
§ 63.6(b)(4)Yes.
§ 63.6(b)(5)Yes.
§ 63.6(b)(6)NoSection reserved.
§ 63.6(b)(7)Yes.
§ 63.6(c)(1)Yes.
§ 63.6(c)(2)Yes.
§ 63.6(c)(3) through (c)(4)NoSection reserved.
§ 63.6(c)(5)Yes.
§ 63.6(d)NoSection reserved.
§ 63.6(e)(1)(i)NoSee § 63.764(j) for general duty requirement.
§ 63.6(e)(1)(ii)No.
§ 63.6(e)(1)(iii)Yes.
§ 63.6(e)(2)NoSection reserved.
§ 63.6(e)(3)No.
§ 63.6(f)(1)No.
§ 63.6(f)(2)Yes.
§ 63.6(f)(3)Yes.
§ 63.6(g)Yes.
§ 63.6(h)(1)No.
§ 63.6(h)(2) through (h)(9)Yes.
§ 63.6(i)(1) through (i)(14)Yes.
§ 63.6(i)(15)NoSection reserved.
§ 63.6(i)(16)Yes.
§ 63.6(j)Yes.
§ 63.7(a)(1)Yes.
§ 63.7(a)(2)YesBut the performance test results must be submitted within 180 days after the compliance date.
§ 63.7(a)(3)Yes.
§ 63.7(a)(4)Yes.
§ 63.7(c)Yes.
§ 63.7(d)Yes.
§ 63.7(e)(1)No.
§ 63.7(e)(2)Yes.
§ 63.7(e)(3)Yes.
§ 63.7(e)(4)Yes.
§ 63.7(f)Yes.
§ 63.7(g)Yes.
§ 63.7(h)Yes.
§ 63.8(a)(1)Yes.
§ 63.8(a)(2)Yes.
§ 63.8(a)(3)NoSection reserved.
§ 63.8(a)(4)Yes.
§ 63.8(b)(1)Yes.
§ 63.8(b)(2)Yes.
§ 63.8(b)(3)Yes.
§ 63.8(c)(1)No.
§ 63.8(c)(1)(i)No.
§ 63.8(c)(1)(ii)Yes.
§ 63.8(c)(1)(iii)No.
§ 63.8(c)(2)Yes.
§ 63.8(c)(3)Yes.
§ 63.8(c)(4)Yes.
§ 63.8(c)(4)(i)NoSubpart HH does not require continuous opacity monitors.
§ 63.8(c)(4)(ii)Yes.
§ 63.8(c)(5) through (c)(8)Yes.
§ 63.8(d)(1)Yes.
§ 63.8(d)(2)Yes.
§ 63.8(d)(3)YesExcept for last sentence, which refers to an SSM plan. SSM plans are not required.
§ 63.8(e)YesSubpart HH does not specifically require continuous emissions monitor performance evaluation, however, the Administrator can request that one be conducted.
§ 63.8(f)(1) through (f)(5)Yes.
§ 63.8(f)(6)Yes.
§ 63.8(g)NoSubpart HH specifies continuous monitoring system data reduction requirements.
§ 63.9(a)Yes.
§ 63.9(b)(1)Yes.
§ 63.9(b)(2)YesExisting sources are given 1 year (rather than 120 days) to submit this notification. Major and area sources that meet § 63.764(e) do not have to submit initial notifications.
§ 63.9(b)(3)NoSection reserved.
§ 63.9(b)(4)Yes.
§ 63.9(b)(5)Yes.
§ 63.9(c)Yes.
§ 63.9(d)Yes.
§ 63.9(e)Yes.
§ 63.9(f)Yes.
§ 63.9(g)Yes.
§ 63.9(h)(1) through (h)(3)YesArea sources located outside UA plus offset and UC boundaries are not required to submit notifications of compliance status.
§ 63.9(h)(4)NoSection reserved.
§ 63.9(h)(5) through (h)(6)Yes.
§ 63.9(i)Yes.
§ 63.9(j)Yes.
§ 63.9(k)YesOnly as specified in § 63.9(j).
§ 63.10(a)Yes.
§ 63.10(b)(1)Yes§ 63.774(b)(1) requires sources to maintain the most recent 12 months of data on-site and allows offsite storage for the remaining 4 years of data.
§ 63.10(b)(2)Yes.
§ 63.10(b)(2)(i)No.
§ 63.10(b)(2)(ii)NoSee § 63.774(g) for recordkeeping of (1) occurrence and duration and (2) actions taken during malfunctions.
§ 63.10(b)(2)(iii)Yes.
§ 63.10(b)(2)(iv) through (b)(2)(v)No.
§ 63.10(b)(2)(vi) through (b)(2)(xiv)Yes.
§ 63.10(b)(3)Yes§ 63.774(b)(1) requires sources to maintain the most recent 12 months of data on-site and allows offsite storage for the remaining 4 years of data.
§ 63.10(c)(1)Yes.
§ 63.10(c)(2) through (c)(4)NoSections reserved.
§ 63.10(c)(5) through (c)(8)Yes.
§ 63.10(c)(9)NoSection reserved.
§ 63.10(c)(10) through (11)NoSee § 63.774(g) for recordkeeping of malfunctions.
§ 63.10(c)(12) through (14)Yes.
§ 63.10(c)(15)No.
§ 63.10(d)(1)Yes.
§ 63.10(d)(2)YesArea sources located outside UA plus offset and UC boundaries do not have to submit performance test reports.
§ 63.10(d)(3)Yes.
§ 63.10(d)(4)Yes.
§ 63.10(d)(5)NoSee § 63.775(b)(6) or (c)(6) for reporting of malfunctions.
§ 63.10(e)(1)YesArea sources located outside UA plus offset and UC boundaries are not required to submit reports.
§ 63.10(e)(2)YesArea sources located outside UA plus offset and UC boundaries are not required to submit reports.
§ 63.10(e)(3)(i)YesSubpart HH requires major sources to submit Periodic Reports semi-annually. Area sources are required to submit Periodic Reports annually. Area sources located outside UA plus offset and UC boundaries are not required to submit reports.
§ 63.10(e)(3)(i)(A)Yes.
§ 63.10(e)(3)(i)(B)Yes.
§ 63.10(e)(3)(i)(C)No.
§ 63.10(e)(3)(i)(D)YesSection reserved.
§ 63.10(e)(3)(ii) through (viii)Yes.
§ 63.10(e)(4)Yes.
§ 63.10(f)Yes.
§ 63.11(a) and (b)Yes.
§ 63.11(c), (d), and (e)Yes.
§ 63.12(a) through (c)Yes.
§ 63.13(a) through (c)Yes.
§ 63.14(a) through (q)Yes.
§ 63.15(a) and (b)Yes.
§ 63.16Yes.

[64 FR 32628, June 17, 1999, as amended at 66 FR 34554, June 29, 2001; 71 FR 20457, Apr. 20, 2006; 72 FR 40, Jan. 3, 2007; 73 FR 78214, Dec. 22, 2008; 77 FR 49581, Aug. 16, 2012; 85 FR 73894, Nov. 19, 2020]