IV 
119TH CONGRESS 
1ST SESSION 
H. RES. 637 
Commemorating the 69th anniversary of the continuous operations of the 
Mauna Loa Observatory. 
IN THE HOUSE OF REPRESENTATIVES 
AUGUST 5, 2025 
Ms. TOKUDA (for herself and Mr. CASE) submitted the following resolution; 
which was referred to the Committee on Science, Space, and Technology 
RESOLUTION 
Commemorating the 69th anniversary of the continuous 
operations of the Mauna Loa Observatory. 
Whereas the Mauna Loa Observatory (referred to in this pre-
amble as the ‘‘MLO’’) is an atmospheric baseline station 
of the Global Monitoring Laboratory within the Earth 
System Research Laboratories (referred to in this pre-
amble as the ‘‘ESRL’’) organized under the National 
Oceanic and Atmospheric Administration’s Office of Oce-
anic and Atmospheric Research; 
Whereas the mission of the ESRL is to measure atmospheric 
constituents that are capable of forcing adjustments to 
the climate of the Earth and those that may deplete the 
ozone layer; 
Whereas the mission of the ESRL is primarily accomplished 
through long-term tropospheric measurements of key at-
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•HRES 637 IH 
mospheric parameters such as carbon dioxide, carbon 
monoxide, methane, chlorofluorocarbons, ozone, sulfur di-
oxide, nitrous oxide, radon, aerosols, optical depth, and a 
spectrum of solar radiation parameters; 
Whereas the MLO, due to its location on the north flank of 
Mauna Loa Volcano, on Hawaii Island, is the premier 
long-term atmospheric monitoring facility on Earth for 
sampling the troposphere as it protrudes through the 
strong marine temperature inversion layer present in the 
region; 
Whereas the MLO, constructed in 1956 and continuously in 
operation since, is the site where the ever-increasing con-
centrations of global atmospheric carbon dioxide have 
been observed; 
Whereas the MLO has been home to hundreds of atmospheric 
research programs— 
(1) with national and international universities and 
government organizations; and 
(2) related to a diverse spectrum of research cat-
egories; and 
Whereas the MLO and its 4 sites on Hawaii Island, including 
the critical administrative office in Hilo, is home to a 
dedicated workforce committed to their mission to ac-
quire, evaluate, and make available accurate, long-term 
records of the atmosphere in a manner that allows the 
causes and consequences of change to be understood: 
Now, therefore, be it 
Resolved, That the House of Representatives— 
(1) commemorates the 69th anniversary of the 
continuous operations of the Mauna Loa Observ-
atory (referred to in this resolution as the ‘‘MLO’’); 
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(2) recognizes the monumental contributions 
that the research conducted at and data produced by 
the MLO has provided to the global leadership in at-
mospheric research of the United States; 
(3) reaffirms the House of Representative’s 
strong support for the critical ongoing operations of 
the MLO, including its 4 sites on Hawaii Island; 
and 
(4) honors the cultural significance of Mauna 
Loa to the Native Hawaiian community. 
Æ 
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