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Description

This is Level-3 daily global gridded (0.25x0.25 degree) Nitrogen Dioxide Product (OMNO2d). OMNO2d data product is a Level-3 Gridded Product where pixel level data of good quality are binned and "averaged" into 0.25x0.25 degree global grids. This product contains Total column NO2 and Total Tropospheric Column NO2, for all atmospheric conditions, and for sky conditions where cloud fraction is less than 30 percent.

Nitrogen dioxide is an important chemical species in both, the stratosphere where it plays a key role in ozone chemistry, and in the troposphere where it is a precursor to ozone production. In the troposphere, it is produced in various combustion processes and in lightning and is an indicator of poor air quality.

The OMNO2d data are stored in version 5 EOS Hierarchical Data Format (HDF-EOS). Each file contains data from the day lit portion of the orbit (~14 orbits). The average file size for the OMNO2d data product is about 12 Mbytes.

Product Summary

Platforms
Aura
Instruments
OMI
Spatial Extent

N: 90 S: -90 E: 180 W: -180

Geographic Region
GLOBAL
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
2004-10-01 to Present
Data Partner
Goddard Earth Sciences Data and Information Services Center (formerly Goddard DAAC), Terrestrial Information Systems Laboratory, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA (NASA/GSFC/SED/ESD/TISL/GESDI
Concept ID
C1266136111-GES_DISC
Data State
ACTIVE
Number of Files/Granules
7706
Processing Level
3
Published
Updated
Science Keywords
Nitrogen Dioxide

Citation

Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.

Copy Citation

Krotkov, N. A. (2013). OMI/Aura NO2 Cloud-Screened Total and Tropospheric Column Daily L3 Global 0.25deg Lat/Lon Grid [Data set]. NASA Goddard Earth Sciences Data and Information Services Center. https://doi.org/10.5067/AURA/OMI/DATA3007 Date Accessed: 2025-12-13

Documents

READ-ME

PI DOCUMENTATION

PUBLICATIONS

Variables

Variables are a set of physical properties whose values determine the characteristics or behavior of something. For example, temperature and pressure are variables of the atmosphere. Parameters and variables can be used interchangeably. Variable level attributes provide individual information for each variable.

The Name in this table is the variable name. Fill value indicates missing or undefined data points in a variable. Valid range is the range of values the variable can store. Scale factor is used to increase or decrease the size of an object and can be used to correct for distortion. For questions on a specific variable, please use the Earthdata Forum.

Name Description Units Data Type Fill Value Valid Range Scale Factor
HDFEOS/GRIDS/ColumnAmountNO2/Data Fields/ColumnAmountNO2 Field=ColumnAmountNO2,StdField=ColumnAmountNO2Std,SolarZenithAngle=[0:85],VcdQualityFlags=~19,XTrackQualityFlags=~[1:254],TerrainReflectivity=[0:1000] molec/cm2 float32 -1.2676506002282E+30 N/A N/A
HDFEOS/GRIDS/ColumnAmountNO2/Data Fields/ColumnAmountNO2CloudScreened Field=ColumnAmountNO2,StdField=ColumnAmountNO2Std,SolarZenithAngle=[0:85],CloudFraction=[0:300],VcdQualityFlags=~19,XTrackQualityFlags=~[1:254],TerrainReflectivity=[0:1000] molec/cm2 float32 -1.2676506002282E+30 N/A N/A
HDFEOS/GRIDS/ColumnAmountNO2/Data Fields/ColumnAmountNO2Trop Field=ColumnAmountNO2Trop,StdField=ColumnAmountNO2TropStd,SolarZenithAngle=[0:85],VcdQualityFlags=~19,XTrackQualityFlags=~[1:254],TerrainReflectivity=[0:1000] molec/cm2 float32 -1.2676506002282E+30 N/A N/A
HDFEOS/GRIDS/ColumnAmountNO2/Data Fields/ColumnAmountNO2TropCloudScreened Field=ColumnAmountNO2Trop,StdField=ColumnAmountNO2TropStd,SolarZenithAngle=[0:85],CloudFraction=[0:300],VcdQualityFlags=~19,XTrackQualityFlags=~[1:254],TerrainReflectivity=[0:1000] molec/cm2 float32 -1.2676506002282E+30 N/A N/A
HDFEOS/GRIDS/ColumnAmountNO2/Data Fields/Weight Weight Factor used for each Grid Cell NoUnits float32 -1.2676506002282E+30 N/A N/A
HDFEOS INFORMATION/StructMetadata.0 HDFEOS INFORMATION/StructMetadata.0 N/A OTHER N/A N/A N/A
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