Total ozone overhead, daily map, near-real-time (OMI/Aura, 0.25 deg)
What it measures. The same daily worldwide ozone map as the standard product, showing how much ozone sits overhead in a column of air plus cloudiness, but delivered fast as a near-real-time version.
How it's made. Made from the OMI instrument on NASA's Aura satellite, choosing the best observation in each grid cell and processing it quickly so the data are available shortly after the satellite passes.
How & where you'd use it. Timely ozone and UV monitoring where speed matters more than the final polished version, such as operational forecasting and rapid public health alerts.
What's measured
Coverage & cadence
- Time span2004-07-15 → ongoing
- Measured byAura (OMI)
- Processing levelLevel 3
- Spatial extent-180, -90, 180, 90
- FormatsHDF-EOS5
- StatusNOT PROVIDED
What you can do with it
- Map air pollutants — NO₂, aerosols, ozone
- Track greenhouse gases and Earth's energy budget
- Feed weather and air-quality analysis
Official description
The OMI science team produces this Level-3 Aura/OMI Global TOMS-Like Total Column Ozone Near Real Time (NRT) gridded product OMTO3e (0.25deg Lat/Lon grids). The OMTO3e product selects the best pixel (shortest path length) data from the good quality filtered level-2 total column ozone data (OMTO3) that fall in the 0.25 x 0.25 degree global grids. Each file contains total column ozone, radiative cloud fraction and solar and viewing zenith angles. The OMTO3e files are stored in the version 5 EOS Hierarchical Data Format (HDF-EOS5). Each file contains daily data from approximately 15 orbits. The maximum file size for the OMTO3e data product is about 2.8 Mbytes.
Get the data
import earthaccess
earthaccess.login(strategy="netrc") # free Earthdata Login
results = earthaccess.search_data(
short_name="OMTO3e",
version="004",
bounding_box=(-122.5, 37.2, -121.8, 37.9), # your area (W,S,E,N)
temporal=("2024-01-01", "2024-12-31"), # your dates
)
files = earthaccess.open(results) # stream straight from OMINRTBrowsing CMR needs no login. Downloading or streaming bytes needs a free Earthdata Login + the earthaccess package.