We operate five monitoring stations in our three county jurisdictional area that continuously provide outdoor air quality information. These monitors measure ground-level ozone (O₃), particle pollution (also known as particulate matter or PM), carbon monoxide (CO), sulfur dioxide (SO₂), and nitrogen dioxide (NO₂). We also have monitors that track meteorological conditions and visibility. In addition, large air pollution sources, like refineries, are required to operate continuous emission monitors to measure air pollution coming directly from their stacks.

POLLUTANT LEGEND

= Sulfur Dioxide (SO₂)
= Particulate Matter or (PM₁₀)
= Ground-Level Ozone (O₃)
= Particulate Matter or (PM_2.5)
= Nitrogen Oxide or (NO₂)

Neighbor AGENCIES

The Northwest Clean Air Agency shares the same airshed with agencies to the the North and South of us:

• Lower Fraser Air Quality Monitoring Network
• Puget Sound Clean Air Agency