The Air Resources Laboratory’s (ARL) mission is to improve the ability of the Nation to protect human and ecosystem health and to support a vibrant economy through advanced atmospheric sciences and technologies. ARL’s research focus is on the surface of the Earth from a few feet below the soil up to 2-3 miles in the atmosphere, known as the boundary layer, which has a direct impact on people’s health and safety, business, and the environment. ARL studies the physical and chemical processes that occur in the boundary layer, on time scales spanning a few hours to several years.

ARL studies the mixing, exchange, and transformation of energy, moisture, trace gases and particles and contributes inputs to meteorological models and forecast operations that are vital in improving weather, climate and air quality forecasts. Primary applications include emergency response, homeland security, air quality, weather forecasts, climate outlooks, commerce and transportation. ARL’s vision is to effectively protect people, the environment, and commercial activities from atmospheric risks using the best available scientific understanding of boundary layer processes.

Primary Research Areas

Surface Atmosphere Exchange

  • Research processes and variables controlling heat and water vapor exchanges between land and atmosphere

Atmospheric Transport and Dispersion

  • Research main processes that drive transport and dispersion in the atmosphere
  • Improve the quality of and assess uncertainties/applicability of modeling tools

Boundary Layer Characterization

  • Improve accuracy of atmospheric models and other forecast and prediction tools to better understand the atmospheric boundary layer 
Smoke from the Dragon Bravo fire at Grand Canyon's North Rim area. Credit: M. Quinn (National Park Service)

July 15, 2025

The Weather Forecast Office in Flagstaff created HYSPLIT runs of chlorine gas released from a burning wastewater treatment plant at the Grand Canyon’s North Rim.

Stock photo of a nuclear power plant

July 7, 2025

The Weather Forecasting Office in St. Louis used the ARL HYSPLIT model for a training exercise in Callaway, MO. Participants in this simulation included local, state and federal agencies.

man in hazardous material gear standing in front of stainless steel tanks.

July 3, 2025

Nuclear accidents happen more often than many people realize across the U.S. and world. NOAA and EPA signed a formal agreement to work together in improving the nation’s ability to respond to these accidents.