The Top 10 Largest Industrial Emitters of PM 2.5 in 2023

A map of Cowlitz County with two polluters identified, WestRock in Longview and the Headquarters Landfill in Castle Rock

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Chart: Henry Brannan for The Daily News/The ColumbianSource: Washington Department of Ecology's "Major Point Source Emissions (2009 – 2023)" dataset. Last Updated: January 2025.Created with Datawrapper