The Golden Gate Bridge shrouded in wildfire smoke in September 2020, seen from a pier at Fort Baker near Sausalito. (Associated Press)

Wildfire smoke now accounts for up to half of all fine-particle pollution in the Western U.S., according to a new study that blames climate change for worsening air quality and health risks in both urban and rural communities in recent years.

The study by researchers at Stanford University and UC San Diego found that the concentration of tiny, lung-damaging pollutants known as PM2.5 that are attributable to wildfire smoke roughly doubled between 2006 and 2018, while the share of pollution from other sources like car and truck exhaust declined.

The trend is most pronounced in Western states and highlights the

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