NASAHourly daytime air quality observations from geostationary orbit over North America, measuring ozone, NO₂, HCHO, and aerosols at unprecedented spatial resolution.
NASA
OMI: Ozone Monitoring Instrument
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NASA
The Ozone Monitoring Instrument (OMI) aboard NASA's Aura satellite has been measuring trace gas columns and aerosol properties from low-Earth orbit since 2004. OMI provides daily global maps of ozone, nitrogen dioxide, sulfur dioxide, formaldehyde, and aerosol index at approximately 13 × 24 km² nadir resolution.
OMI data has been instrumental in documenting the decline of SO₂ emissions from power plants and smelters, tracking volcanic eruptions, and monitoring urban NO₂ trends globally. The dataset is widely used for air quality model evaluation and emission inventory verification.
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Documentation, algorithm details, and background reading for OMI.
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Access OMI through the provider portal or download it directly.
Tutorials
Self-paced tutorials to help you get started with OMI.
Getting started with OMI
An introduction to the OMI dataset — what it measures, how it is produced, and when to use it.
Accessing and downloading OMI dataFind, subset, and download OMI data, with tips for common file formats and access tools.
Exploring OMI in the AIR4US visualization toolLoad OMI layers in the AIR4US visualization tool and interpret them alongside other air quality data.
Cite this dataset
NASA GSFC / KNMI. OMI: Ozone Monitoring Instrument. 2004 – Present. Accessed via the AIR4US Portal, https://aura.gsfc.nasa.gov/omi.html.
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