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---
type: "Bill"
title: "Ozone Mitigation Measures"
description: "Section 2 of the act requires the division of administration (division) in the department of public health and environment (department) to propose rules to the air quality control commission (commission) to reduce certain emissions of oxides of nitrogen (NOx) generated by upstream oil and gas operations in certain areas of the state by 50% by 2030 relative to 2017 NOx emission levels."
jurisdiction: "us/states/co"
legislature: "Colorado General Assembly"
session: "2024A"
identifier: "SB 24-229"
citation: "Colorado SB 24-229 (2024A)"
classification: ["bill"]
subjects: []
status: "enacted"
primary_sponsors: ["Faith Winter", "Jennifer Bacon", "Jenny Willford", "Kevin Priola"]
version_count: 10
action_count: 15
vote_count: 4
first_action: "2024-04-30T06:00:00+00:00"
last_action: "2024-05-16T06:00:00+00:00"
source: "openstates"
source_identifier: "ocd-bill/77f72c5d-b14f-41c5-8476-23897c8b6f83"
source_url: "https://leg.colorado.gov/bills/sb24-229"
source_hash: "e2db51f943470b370d15b8d4312d759405f7986d11049fea59b263684b3edcfe"
vintage: "2026-07-01"
source_snapshot: "https://data.openstates.org/daily/2026-07-01/public.pgdump"
retrieved_at: "2026-07-06"
confidence: "reported"
tags: ["legislation", "bill", "us-co"]
---
# Colorado SB 24-229 (2024A) — Ozone Mitigation Measures
Section 2 of the act requires the division of administration (division) in the department of public health and environment (department) to propose rules to the air quality control commission (commission) to reduce certain emissions of oxides of nitrogen (NOx) generated by upstream oil and gas operations in certain areas of the state by 50% by 2030 relative to 2017 NOx emission levels.
## Version chain
The bill's text revisions, in order — the diff chain from filing to enrollment.
1. **Committee Amendment** (committee substitute) — [source](https://leg.colorado.gov/sites/default/files/2024a_sb229_h_app_002.pdf)
2. **Engrossed (05/03/2024)** (committee substitute) — [source](https://leg.colorado.gov/sites/default/files/documents/2024A/bills/2024a_229_eng.pdf)
3. **Final Act (05/10/2024)** (committee substitute) — [source](https://leg.colorado.gov/sites/default/files/documents/2024A/bills/2024a_229_enr.pdf)
4. **Introduced (04/30/2024)** (committee substitute) — [source](https://leg.colorado.gov/sites/default/files/documents/2024A/bills/2024a_229_01.pdf)
5. **PA1 (05/03/2024)** (committee substitute) — [source](https://leg.colorado.gov/sites/default/files/documents/2024A/bills/2024a_229_s_app_01.pdf)
6. **PA2 (05/05/2024)** (committee substitute) — [source](https://leg.colorado.gov/sites/default/files/documents/2024A/bills/2024a_229_h_fin_01.pdf)
7. **Reengrossed (05/04/2024)** (committee substitute) — [source](https://leg.colorado.gov/sites/default/files/documents/2024A/bills/2024a_229_ren.pdf)
8. **Rerevised (05/06/2024)** (committee substitute) — [source](https://leg.colorado.gov/sites/default/files/documents/2024A/bills/2024a_229_rer.pdf)
9. **Revised (05/05/2024)** (committee substitute) — [source](https://leg.colorado.gov/sites/default/files/documents/2024A/bills/2024a_229_rev.pdf)
10. **Signed Act (05/16/2024)** (committee substitute) — [source](https://leg.colorado.gov/sites/default/files/2024a_229_signed.pdf)
## Votes
- REPASS — **2312** (pass) · upper
- BILL — **2211** (pass) · upper
- CONCUR — **2510** (pass) · upper
- BILL — **4318** (pass) · lower
## Sponsors
- Faith Winter — primary (person)
- Jennifer Bacon — primary (person)
- Jenny Willford — primary (person)
- Kevin Priola — primary (person)
## Timeline
The legislative action history — every referral, reading, and vote.
- **2024-05-16T06:00:00+00:00** Governor Signed `executive-signature`
- **2024-05-10T06:00:00+00:00** Sent to the Governor `executive-receipt`
- **2024-05-10T06:00:00+00:00** Signed by the Speaker of the House
- **2024-05-09T06:00:00+00:00** Signed by the President of the Senate
- **2024-05-06T06:00:00+00:00** Senate Considered House Amendments - Result was to Concur - Repass
- **2024-05-06T06:00:00+00:00** House Third Reading Passed - No Amendments `passage, reading-3`
- **2024-05-05T06:00:00+00:00** House Second Reading Special Order - Passed with Amendments - Committee
- **2024-05-05T06:00:00+00:00** House Committee on Appropriations Refer Unamended to House Committee of the Whole `committee-passage, referral-committee`
- **2024-05-04T06:00:00+00:00** House Committee on Finance Refer Amended to Appropriations `referral-committee`
- **2024-05-04T06:00:00+00:00** Introduced In House - Assigned to Finance `introduction`
- **2024-05-04T06:00:00+00:00** Senate Third Reading Passed - No Amendments `passage, reading-3`
- **2024-05-03T06:00:00+00:00** Senate Second Reading Special Order - Passed with Amendments - Committee
- **2024-05-03T06:00:00+00:00** Senate Committee on Appropriations Refer Amended to Senate Committee of the Whole `committee-passage, referral-committee`
- **2024-05-02T06:00:00+00:00** Senate Committee on Finance Refer Unamended to Appropriations `referral-committee`
- **2024-04-30T06:00:00+00:00** Introduced In Senate - Assigned to Finance `introduction`
## Source
OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/77f72c5d-b14f-41c5-8476-23897c8b6f83`. Confidence: reported (aggregated from official Colorado legislature records).