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Climate Change

Limiting carbon pollution through the Washington Clean Air Rule

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In an effort to protect all that Washington has to offer for future generations, we have set a cap on carbon pollution. This will help slow climate change and limit the projected effects on our state's coastal communities, agricultural industries, and drinking water supplies.

Climate change is the most significant environmental issue of our lifetime, and it is a priority for Ecology to protect what we have today for future generations. So, we've been focusing our efforts on Washington's first-ever rule to cap and reduce carbon pollution.

Under our new rule, businesses that are responsible for 100,000 metric tons of carbon pollution annually are required to cap and then gradually reduce their emissions. Organizations regulated by the Clean Air Rule are required to reduce emission beginning in 2017.

Rule basics


Get answers to the most commonly asked questions.



Read a high-level snapshot of the rule.



> Compliance
> The reserve
> Economic impacts



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Video gallery

Reducing pollution

Rule update

Capping and reducing


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