Yesterday 40 environmental advocacy groups delivered a joint letter opposing the construction of an oil pipeline from Suncor, a Canadian energy company that operates the Commerce City Refinery. The refinery is the only oil refinery in Colorado.

Earlier this month, a coalition of environmental advocacy groups asked Colorado’s air quality regulatory agencies to deny a proposed air pollution permit submitted by Suncor Energy for its petroleum refinery located in Commerce City, north of Denver. The groups argued that the permit does not adequately ensure a decrease in pollution from the embattled refinery.

Beginning in November, an environmental justice group will distribute air-quality monitors to the residents of Commerce City and to the north Denver neighborhoods Globeville and Elyria-Swansea.