WILDFIRE SMOKE REVERSES US OZONE AIR QUALITY GAINS, STUDY FINDS

A new study has found that wildfire smoke is undoing decades of air quality improvements across the United States. Researchers determined that smoke-driven ozone pollution has offset progress made under clean air regulations. The findings identify wildfires as a significant and growing source of ground-level ozone. NASA provided funding for the research.

Ground-level ozone forms when pollutants from combustion react with sunlight, and wildfire smoke contributes the chemical precursors that drive this process. The United States had recorded sustained improvements in ozone air quality following the implementation of federal clean air standards. The study found those gains have been partially reversed in regions affected by wildfire smoke. Wildfires have increased in frequency and scale across the western United States in recent decades.

The research raises questions about the effectiveness of existing air quality frameworks in accounting for wildfire-related pollution. Current clean air regulations primarily target industrial and vehicle emissions rather than wildfire smoke. The findings indicate that meeting federal ozone standards will require addressing wildfire smoke as a distinct pollution source. Researchers have presented the data as evidence that climate-driven changes in wildfire activity carry measurable public health consequences.