• Devils Postpile Formation

    Devils Postpile

    National Monument California

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  • 37-Foot Vehicle Length Restriction on the Devils Postpile Access Road

    Devils Postpile has a limit of 37 feet for vehicles on the monument road. This may change during weather events, construction activities, vehicle congestion, or for safety reasons. Call or email for more information. More »

Air Quality

Although most visitors would probably anticipate that Devils Postpile National Monument is a clean or remote site with excellent air quality, the reality is that the monument can sometimes experience the same high levels of photochemical smog that are routinely found in urban and suburban areas. Pollutants like ozone (O3) are of particular concern to National Park Service managers; when present in high concentrations they can have a negative impact on the local plants and wildlife, and they can also be unhealthy for monument visitors and staff.

In order to assess the overall air quality at Devils Postpile and to get a better understanding of the issues that can influence air pollution levels at the monument, a collaborative team of atmospheric scientists are conducting on-site measurements throughout the summer of 2013. Measured species will include ozone (O3), nitrogen oxides (NO and NO2), volatile organic compounds (VOCs), particulate matter (PM2.5), nitric acid (HNO3), and ammonia (NH3). The two main goals of this project will be to (1) assess the potential impacts of the twelve reduced-emissions shuttle buses that were recently granted by Alternative Transportation and Public Lands for operation in Devils Postpile and the Reds Meadow Valley, and (2) obtain a better understanding of how much of the air pollution present at the monument is produced locally, as opposed to being transported from more populated regions, such as the Central Valley to the west.

Visitors who are interested in learning more about these topics are encouraged to access a recent peer-reviewed scientific study that was published in Atmospheric Environment: Surface ozone at the Devils Postpile National Monument receptor site during low and high wildfire years; A. Bytnerowicz, et al.; Atmospheric Environment 65 (2013), pages 129-141.

A copy of this information is also available at the Devils Postpile Ranger Station to take home. A printout of the publication is available for your review during your visit.

Research in national parks is usually a collaborative effort between many dedicated agencies and groups. The following are involved in the air quality studies at Devils Postpile:
  • National Park Service
  • U.S. Forest Service – Pacific Southwest Research Station
  • Saint Mary’s College of California, Department of Chemistry
  • Desert Research Institute
  • University of California, Merced


Did You Know?

The John Muir and Pacific Crest trails take hikers into the Ansel Adams Wilderness.

The John Muir and Pacific Crest Trails join into one trail in the monument. Many "through-hikers" take advantage of the shuttle system and other amenities at Devils Postpile to refuel and rest. More...