From 1990 to 2005, HMMH assisted the National Park Service (NPS) with technical expertise on air tours over national parks. We conducted a variety of noise and soundscape studies connected with air tour operations. These included:
- An evaluation of tour aircraft sound propagation in quiet areas including aircraft audibility models and their relationship to sound level.
- Measurement and reporting of acoustic profiles in the Grand Canyon, Hawai’i Volcanoes, Haleakalā, Glacier, Grand Teton, Bryce Canyon, and Rocky Mountain National Parks.
- Development of a sampling plan and performance of park visitor dose-response studies at Grand Canyon, Hawai’i Volcanoes, and Haleakalā National Parks.
- Preparation of the National Park Service’s Air Tour Overflight Report to Congress, required under Public Law 100-91, 1995.
- In partnership with the Volpe Center, development of the Air Tour Management Plan (ATMP) Noise Monitoring Protocol.
- Measurement of air tour and ambient sound levels at Hawai’i Volcanoes National Park.
- Design and performance of air tour passenger and manager surveys.