• Views from Penobscot Mountain summit.


    National Park Maine

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  • Temporary Road Closure

    A section of the Western Mtn Road in Southwest Harbor will be closed until 8/18 while park crews replace a culvert with a new fish-friendly open bottom culvert. For more information and a map visit our Getting Around Page. More »

  • Trail Closure: Gorge Path weekdays, 7 am - 4 pm

    The section of the Gorge Path between the Hemlock Path intersection and the A. Murray Young Trail intersection is closed until rehabilitation work is completed. The closure will be in effect Mondays through Fridays only, from 7 am to 4 pm.

Air Resources

The air resources management program at Acadia is a comprehensive program designed to assess air pollution impacts and protect air quality-related resources. The park is downwind from large urban and industrial areas to the south and west and periodically experiences high concentrations of air pollutants, primarily as a result of long-range transport. As a Class I area under the Clean Air Act, Acadia is afforded the highest level of protection under the act.

The air program at Acadia began in the early 1980s and includes monitoring, research, and regulatory interaction with state and federal agencies. The core program includes long-term monitoring for ozone, sulfur dioxide, nitrogen oxides, volatile organic compounds (VOCs), fine particulates, visibility, mercury deposition and acid precipitation. Research has been conducted to determine the biological effects of selected air pollutants on park resources.

The air resources program is a collaborative effort involving the National Park Services' Air Resources Division and Northeast Regional Office, the Maine Department of Environmental Protection, and Acadia natural resource staff.


Did You Know?

The wide carriage road is lined by the spring foliage of birch trees.

Acadia National Park's carriage road system, built by John D. Rockefeller Jr., has been called “the finest example of broken stone roads designed for horse-drawn vehicles still extant in America.” Today, you can hike or bike 45 miles of these scenic carriage roads in the park.