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In Situ Carbon Dioxide, Methane, and Carbon Monoxide Mole Fractions from the Los Angeles Megacity Carbon Project

Metadata Updated: July 9, 2025

NOTE: please see the latest (April 2025) update at https://doi.org/10.18434/mds2-3814 . Hourly observations of carbon dioxide (CO2) and methane (CH4) mole fractions in dry air from tower- and rooftop-based sites in the Los Angeles Megacity Carbon Project network. Carbon monoxide (CO) observations exist at several stations in this network but are not included in this data release pending additional calibration verification. Please contact the authors for higher frequency data, which are available on request. Data files are comma delimited (CSV). Measurements of each species may be from two or more different heights above ground. Site locations, heights, and other information are in a separate ASCII (CSV) file (LAM_sites.csv). Data are currently reported for the years 2015-2023. An ASCII Readme file (LAM_Readme_2024) is also posted. CO2 data are reported on the NOAA/WMO X2007 calibration scale. A full revision on the NOAA/WMO X2019 scale for CO2 is forthcoming, and will be linked here. CH4 data are reported on the NOAA/WMO X2004A calibration scale. Current update: May 17, 2024.

Access & Use Information

Public: This dataset is intended for public access and use. License: See this page for license information.

Downloads & Resources

Dates

Metadata Created Date May 17, 2021
Metadata Updated Date July 9, 2025

Metadata Source

Harvested from NIST

Additional Metadata

Resource Type Dataset
Metadata Created Date May 17, 2021
Metadata Updated Date July 9, 2025
Publisher National Institute of Standards and Technology
Maintainer
Identifier ark:/88434/mds2-2388
Language en
Data Last Modified 2021-05-03 00:00:00
Category Environment:Greenhouse gas measurements
Public Access Level public
Bureau Code 006:55
Metadata Context https://project-open-data.cio.gov/v1.1/schema/data.json
Schema Version https://project-open-data.cio.gov/v1.1/schema
Catalog Describedby https://project-open-data.cio.gov/v1.1/schema/catalog.json
Harvest Object Id c8fd2015-994a-41da-bf30-cba21f7229ad
Harvest Source Id 74e175d9-66b3-4323-ac98-e2a90eeb93c0
Harvest Source Title NIST
Homepage URL https://data.nist.gov/od/id/mds2-2388
License https://www.nist.gov/open/license
Old Spatial Southern California, United States
Program Code 006:047
Replaces ark:/88434/mds2-2388
Source Datajson Identifier True
Source Hash 17f7ea6847c4068dab3a4b0d3b0306aa23cf71b040e90afe41f5b6681907bffe
Source Schema Version 1.1
Spatial
Temporal 2015-01-01/2019-12-31

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