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Full catalog/TOMSN7L3mtoz
TOMSN7L3mtoz·v008·dataset

Total ozone overhead, monthly (Nimbus-7 TOMS)

TOMS Nimbus-7 Total Column Ozone Monthly L3 Global 1 deg x 1.25 deg Lat/Lon Grid V008 (TOMSN7L3mtoz) at GES DISC
atmosphere NASA GES_DISC Level 3
In plain English

What it measures. Monthly maps of total ozone in a column of air, meaning all the ozone stacked between the ground and the top of the atmosphere directly overhead.

How it's made. Built from the TOMS instrument on the Nimbus-7 satellite and averaged over each month onto a worldwide grid, stored as simple text files.

How & where you'd use it. Valuable for studying the ozone layer and its history, including long-term trends, since Nimbus-7 provides an early baseline record.

What's measured

ATMOSPHERE › ATMOSPHERIC CHEMISTRY › OXYGEN COMPOUNDS › ATMOSPHERIC OZONE › TOTAL OZONE

Coverage & cadence

  • Time span1978-11-01 → 1993-04-30
  • Measured byNimbus-7 (TOMS)
  • Processing levelLevel 3
  • Spatial extent-180, -90, 180, 90
  • StatusCOMPLETE

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

This Nimbus-7 Total Ozone Mapping Spectrometer (TOMS) version 8 monthly averaged global gridded data product contains total column ozone values. The data are mapped to a global grid of size 180 x 288 with a lat-long resolution of 1.00 x 1.25 degrees. These data are stored in an ASCII format. The TOMS data were produced by the Laboratory for Atmospheres at NASA Goddard Space Flight Center (Code 614).

Get the data

tomsn7l3mtoz_access.py
import earthaccess
earthaccess.login(strategy="netrc")          # free Earthdata Login

results = earthaccess.search_data(
    short_name="TOMSN7L3mtoz",
    version="008",
    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 GES_DISC
Browsing CMR needs no login. Downloading or streaming bytes needs a free Earthdata Login + the earthaccess package.