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Metro Denver and the northern Front Range just experienced one of the worst ozone pollution seasons in 10 years, with 40 days when air quality measurements exceeded federal standards.

A summary released by the Regional Air Quality Council, a quasi-governmental agency that makes recommendations for reducing air pollution, said the region recorded more days above federal pollution standards than it did in eight of the last 10 years. The ozone season runs from late May to early September.

The council called for "more immediate action" by the state to bring the region into federal compliance since the Environmental Protection Agency has set a 2027 deadline for the region to show improvement.

"It is clear we are moving in the wrong direction with ozone pollution," said Kate Merlin, a staff attorney with WildEarth Guardians, an advocacy group.

The council's summary blamed the Front Range's continued struggles with ozone pollution on a growing population, increased oil and gas production, heavy vehicle traffic, urban sprawl, climate change and struggling public transit systems.

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