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Full catalog/PACE_OCI_L3M_TRGAS
PACE_OCI_L3M_TRGAS·v3.0·dataset

Nitrogen dioxide and ozone air pollution, mapped (PACE)

PACE OCI Level-3 Global Mapped Trace Gas Concentrations (NO2, O3) Data, version 3.0
atmosphere NASA OB_CLOUD Level 3 active netCDF-4
In plain English

What it measures. Globally mapped amounts of two air pollutants in the atmosphere: nitrogen dioxide and ozone, given as total vertical columns over each location.

How it's made. Derived from the OCI instrument on NASA's PACE satellite and averaged onto a global map (Level-3).

How & where you'd use it. Supports air-quality and atmospheric chemistry studies, and also helps correct PACE ocean-color measurements. Users should apply quality flags to screen out cloud-affected readings.

What's measured

ATMOSPHERE › ATMOSPHERIC CHEMISTRY › TRACE GASES/TRACE SPECIESAtmosphere › Atmospheric Chemistry

Coverage & cadence

  • Time span2024-03-05 → ongoing
  • Measured byPACE (OCI)
  • Processing levelLevel 3
  • Spatial extent-180, -90, 180, 90
  • FormatsnetCDF-4
  • StatusACTIVE

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 Trace Gas Concentrations (TRGAS) suite provides key atmospheric column constituents. These trace-gas fields support both atmospheric science (e.g., air-quality and chemistry studies) and ocean-color atmospheric correction. Users should apply the quality and L2 flags to screen cloud effects, high solar-zenith conditions, and other retrieval issues before analysis. Geophysical variables in this suite include: - total_column_no2 – total vertical column nitrogen dioxide (molecules cm⁻²) - total_column_o3– total vertical column ozone (Dobson units)

Get the data

pace_oci_l3m_trgas_access.py
import earthaccess
earthaccess.login(strategy="netrc")          # free Earthdata Login

results = earthaccess.search_data(
    short_name="PACE_OCI_L3M_TRGAS",
    version="3.0",
    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 OB_CLOUD
Browsing CMR needs no login. Downloading or streaming bytes needs a free Earthdata Login + the earthaccess package.