Measurements at NOAA's Mauna Loa Observatory stopped following the recent eruption of the Mauna Loa volcano, when lava flow blocked staff access and took out power lines to the facility.

Under an emergency agreement, NOAA and the University of Hawaii have established a temporary measurement site at the nearby Mauna Kea volcano for the critical CO2 record and other atmospheric measurements taken at the observatory.

Media can contact: Theo Stein (303) 819-7409 ( or Karin Vergoth 303-632-6413‬ (


EPA logo US Environmental Protection Agency (EPA) / National Exposure Research Laboratories (NERL) / Human Exposure and Atmospheric Sciences Division (HEASD)

What does this program measure?

How does this program work?

EPA-approved 47 mm Teflon filters with unique identification numbers stamped on the polypropylene support ring and Teflon filters are weighed, handled, and deployed in accordance with the EPA PM 2.5 Chemical Speciation Network. This project involves a Rupprecht & Patashnik (R&P) Dichotomous Partisol-Plus Model 2025 automated sequential dichotomous sampler collection system, that is capable of collecting a minimum of seven days of particulate samples without operator assistance. Sampling only occurs, however, during down slope wind conditions at MLO.

Why is this research important?

The objectives are to accumulate a long-term record of fine (<2.5 µm) and coarse (2.5 – 10 µm) particulate chemistry to support receptor-modeling analysis of source-receptor relationships for mercury.

Are there any trends in the data?

How does this program fit into the big picture?

What is it's role in global climate change?

Comments and References

Lead Investigator(s):

Dr Matthew S. Landis

MLO Contact(s):

Aidan Colton
808-933-6965 (x233)
Darryl Kuniyuki
808-933-6965 (x236)

Web Site(s)

Date Started

August 23, 2001

Related Programs

EPA Aethalometer
EPA Mercury Monitoring
EPA Mercury Precipitation
EPA Ambient Ion Monitor
EPA Sequential Fine Particle
EPA Sulfur Dioxoide
EPA Surface Ozone

EPA Dichotomous Partisol Collector Open
Dichotmous sampler

EPA Dichotomous Partisol Collector Top
Inlet for sampler
Virtual Impactor
Virtual impactor