About ARL

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 (aka 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.

In particular, 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 and climate outlooks, and 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.

ARL News

Ariel Stein Appointed ARL Director

Dr. Stein standing in his office in front of a NOAA plaque and enlarged copy of an article that he authored

May 9, 2022
NOAA has announced Dr. Ariel Stein will be the Director, Air Resources Laboratory (ARL), effective May 8, 2022. Dr. Stein is currently Director of NOAA’s Global Monitoring Laboratory. Ariel has agreed to serve as Acting Director of Global Monitoring Laboratory (GML) until the permanent GML position is filled.

In January 2022, Stein was selected to the Senior Executive Service and was appointed as the Director of NOAA’s Global Monitoring Laboratory (GML) in Boulder, Colorado. Dr. Stein became Acting Deputy Director of ARL in 2017. In his career at ARL, Ariel led the development of hybrid dispersion modeling techniques, including the Hybrid Single Particle Lagrangian Integrated Trajectory (HYSPLIT) model, a widely utilized atmospheric transport and dispersion model.