The City Council in Maine's largest city is the latest municipality in the state to pass a resolution asking Congress to protect and defend the Clean Air Act.
Portland passed its resolution on Monday night. The city joins Bangor, Augusta, Waterville, Hallowell, Lewiston and South Portland, which have passed similar resolutions.
Portland's resolution calls for "stronger federal ozone standards, and all national, state, and community efforts to address the root causes of climate change."
The total population of the Maine municipalities that have passed the clean air resolutions is about 200,000.
The Clean Air Act was established in 1970 to address air pollution, mostly seen in the dense smog around big cities and industrial centers. It's been revised twice since.