Statutes, codes, and regulations
Washington Administrative Code
Title 296 - Labor and Industries, Department ofChapter 296-307 - Safety standards for agricultureFIELD OPERATIONS AND GENERAL REQUIREMENTS
Part G-1 - Rollover Protective Structures and Overhead Protection
Section 296-307-09860 - Appendix B: Calculating the Air Quality Index for PM[2.5] (nonmandatory)

Wash. Admin. Code § 296-307-09860

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Current through Register Vol. 24-23, December 1, 2024
Section 296-307-09860 - Appendix B: Calculating the Air Quality Index for PM[2.5] (nonmandatory)

The Air Quality Index (AQI) for PM2.5 is calculated as follows:

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PM2.5 THRESHOLDS1

AQI1

AQI CATEGORY1

WA DOH HEALTH MESSAGING2

0.0-12.0

0-50

Good

It is a great day to be active outside and a good time to make a plan if worse air quality is in the forecast.

12.1-35.4

51-100

Moderate

Some people are especially sensitive to lower levels of particle pollution and should reduce exposure. For example, limit time outside and avoid strenuous outdoor activity. All sensitive groups should watch for symptoms.

35.5-55.4

101-150

Unhealthy for sensitive groups

Sensitive groups should take steps to reduce exposure. Limit time outside, avoid strenuous outdoor activity, and follow tips for cleaner indoor air. Everyone should watch for symptoms as a sign to reduce exposure.

PM2.5 THRESHOLDS1 55.5-150.4

AQI1 151-200

AQI CATEGORY1 Unhealthy

WA DOH HEALTH MESSAGING2 Everyone should reduce exposure. Limit time outside, avoid strenuous outdoor activity, and follow tips for cleaner indoor air.

150.5-250.4

201-300

Very unhealthy

Everyone should reduce exposure. Stay inside and filter indoor air to keep it cleaner. Go elsewhere for cleaner air, if needed.

250.5-350.4

301-400

Hazardous

Everyone should reduce exposure. Stay inside and filter indoor air to keep it cleaner. Go elsewhere for cleaner air, if needed.

350.5-500.4

401-500

Hazardous

Everyone should reduce exposure. Stay inside and filter indoor air to keep it cleaner. Go elsewhere for cleaner air, if needed.

[GREATER THAN] 500.4

Beyond the AQI

Hazardous (beyond the AQI)

1U.S. EPA. September 2018. Technical Assistance Document for the Reporting of Daily Air Quality - The Air Quality Index (AQI). EPA 454/B-18-007. Research Triangle Park, North Carolina.

2Washington Department of Health. April 2022, accessed April 2023. Washington Air Quality Guide for Particle Pollution: https://doh.wa.gov/sites/default/files/legacy/Documents/4300/waqa%20infographic%5fEnglish.pdf?uid=64384c71c8715

Wash. Admin. Code § 296-307-09860

Adopted by WSR 24-01-070, Filed 12/14/2023, effective 1/15/2024