Navigating air quality rules: What businesses need to know about PM2.5 changes
The Environmental Protection Agency (EPA) updated air quality rules for fine particle pollution (PM2.5), reducing the annual standard from 12.0 to 9.0 micrograms per cubic meter. The rule change was announced on February 7, 2024 and was published as a final rule in the Federal Register on March 6, 2024. The change was based on research linking PM2.5 to health problems like heart disease and early death.
Within one year of the final rule (February 7, 2025), governors from each state were required to submit area designation recommendations (attainment, nonattainment, or unclassifiable) to EPA. By February of 2026 (at the latest) EPA is expected to issue final area designations based on State recommendations, air quality data, and other factors.
There is a caveat that on March 12, 2025, EPA announced that the agency will reconsider the rule that tightened the standard from 12.0 to 9.0 micrograms per cubic meter by reviewing implementation concerns and getting stakeholder feedback, but as of this writing, the tighter standard is still in place.
If your business is in one of the areas that will be newly listed as nonattainment for PM2.5, you will face new rules designed to improve air quality. Understanding these changes will help you stay compliant and keep operations running smoothly.
Check out this explanation of nonattainment on Compliance Network's Environmental Institute.
Who will be affected?
The stricter PM2.5 rule will impact many industries, particularly those that emit a lot of fine particle pollution. Some of the most affected sectors include:
- Manufacturing & Heavy Industry – Factories making steel, cement, or chemicals may need stronger pollution controls.
- Power Generation – Coal and gas power plants may have tighter limits, requiring better filtration systems.
- Transportation & Logistics – Ports, rail yards, and trucking centers could have new rules reducing diesel pollution.
- Construction & Mining – Dust and particles from digging, moving materials, and using equipment may need stricter control.
- Agriculture – Large farms, especially those handling animals or grain, may need better dust control.
- Oil & Gas – Refineries and drilling sites may face tougher rules on pollution from burning fuel.
These industries may see higher costs, stricter permits, and changes to operations to meet the new standards.
Tougher pollution limits
Businesses in nonattainment areas must follow stricter PM2.5 rules. This may mean updating operations or investing in better pollution control technology. The goal is to reduce fine particle emissions that harm air quality and health.
New permit rules
Businesses expanding or changing operations that increase PM2.5 pollution may need new permits. These permits show compliance with tighter pollution limits.
State rules may change
States with nonattainment areas must update their air quality plans. This could mean new industry rules, such as lowering emissions, increasing monitoring, or changing reporting requirements.
Increased monitoring & reporting
Expect closer tracking of your business’ pollution levels, including real-time monitoring and more frequent reports. Compliance checks may be stricter in nonattainment areas.
Offsetting pollution
If a business increases PM2.5 pollution, it may need to offset that by reducing pollution somewhere else in the same area. This ensures the total pollution level does not rise.
Costs & economic effects
Businesses in nonattainment areas may see higher costs due to stricter rules. Local governments might offer rewards or fines to encourage pollution reductions. Companies may need to find cost-effective ways to lower their PM2.5 levels while staying efficient.
How to prepare
- Review your business’ pollution levels and find ways to lower them.
- Stay updated on new local and federal rules.
- Work with state agencies to understand new compliance expectations.
- Invest in cleaner technology to stay ahead of regulations.
Key to Remember: By having a plan for the possibility of nonattainment now, your business can adjust to the new PM2.5 rules while helping improve air quality and public health.