# WAC 296-62-135: WAC 296-62-135. Oxygen deficient atmospheres

> Washington · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_296_62_135

## Section

- **Citation:** WAC 296-62-135
- **Heading:** WAC 296-62-135. Oxygen deficient atmospheres
- **Jurisdiction:** Washington
- **Kind:** Regulations
- **Status:** In force
- **Text as of:** August 14, 2026
- **Source:** Compiled text
- **Location:** Washington Administrative Code / Title 296 / Chapter 296-62 / Section 296-62-135

## Text

(1) Definition. A lack of sufficient oxygen is deemed to exist if the atmosphere at sea level has less than 19.5% oxygen by volume or has a partial pressure of oxygen of 148 millimeters of mercury (mm Hg) or less. This may deviate when working at higher elevations and should be determined for an individual location. Factors such as acclimatization, physical conditions of the persons involved, etc., must be considered for such circumstances and conditions.
(2) Entering areas with possible oxygen deficient atmospheres. Workers entering any area where a lack of sufficient oxygen is probable must be supplied with and must use approved equipment (for specific requirements see applicable provisions of chapters 296-62 , 296-307 (Part-U3), 296-809 and 296-841 WAC) capable of providing safe respirable air, or prior to entry and at all times when workers are in such areas a sufficient supply of safe, respirable air must be provided. All workers so exposed must be under constant observation. If the oxygen content is unknown or may change during occupation, tests must be required prior to and during occupation of questionable areas.

## Nearby sections

- [WAC 296-62-005 WAC 296-62-005. Occupational health and environmental control—Foreword](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_296_62_005.md)
- [WAC 296-62-010 WAC 296-62-010. Purpose and scope](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_296_62_010.md)
- [WAC 296-62-020 WAC 296-62-020. Definitions applicable to all sections of this chapter](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_296_62_020.md)
- [WAC 296-62-040 WAC 296-62-040. Unconstitutionality clause](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_296_62_040.md)
- [WAC 296-62-050 WAC 296-62-050. Application for waiver or variances](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_296_62_050.md)
- [WAC 296-62-055 WAC 296-62-055. Retain labeling required by the department of transportation](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_296_62_055.md)
- [WAC 296-62-060 WAC 296-62-060. Control requirements in addition to those specified](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_296_62_060.md)
- [WAC 296-62-073 WAC 296-62-073. Carcinogens—Scope and application](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_296_62_073.md)
- [WAC 296-62-135 WAC 296-62-135. Oxygen deficient atmospheres](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_296_62_135.md)
- [WAC 296-62-200 WAC 296-62-200. Coke oven emissions](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_296_62_200.md)
- [WAC 296-62-500 WAC 296-62-500. Hazardous drugs](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_296_62_500.md)
- [WAC 296-62-05510 WAC 296-62-05510. Scope](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_296_62_05510.md)
- [WAC 296-62-05520 WAC 296-62-05520. Retain readily visible DOT labeling](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_296_62_05520.md)
- [WAC 296-62-07302 WAC 296-62-07302. Communication of hazards](https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_296_62_07302.md)

---

Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/STATE_WA_ADC_296_62_135. Check the current official text before relying on it. Not legal advice.