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Full catalog/TRPSDL2PANCRS1FS
TRPSDL2PANCRS1FS·v1·dataset

PAN smog chemical in the air (NOAA-20, standard)

TROPESS CrIS-JPSS1 L2 Peroxyacetyl Nitrate for Forward Stream, Standard Product V1 (TRPSDL2PANCRS1FS) at GES DISC
atmosphere NASA GES_DISC Level 2 active
In plain English

What it measures. The amount and vertical layering of peroxyacetyl nitrate (PAN), a chemical tied to smog and air pollution, from the surface up high into the atmosphere, along with uncertainty estimates.

How it's made. Retrieved from the CrIS instrument on the NOAA-20 (JPSS-1) satellite using the TROPESS project's optimal-estimation algorithm, with one file produced per day at about 14-kilometer detail.

How & where you'd use it. Helps scientists track air pollution and the chemistry that forms smog, including how pollutants travel long distances through the atmosphere.

What's measured

ATMOSPHERE › ATMOSPHERIC CHEMISTRY › NITROGEN COMPOUNDS › PEROXYACETYL NITRATE

Coverage & cadence

  • Time span2021-04-01 → ongoing
  • Measured byJPSS-1 (CrIS)
  • Processing levelLevel 2
  • Spatial extent-180, -90, 180, 90
  • 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 TROPESS CrIS-JPSS1 L2 Peroxyacetyl Nitrate for Forward Stream, Standard Product contains the vertical distribution of the retrieved atmospheric state of peroxyacetyl nitrate (PAN), formal uncertainties, and diagnostic information measured by the CrIS instrument on the JPSS-1 (NOAA-20) satellite. The forward stream standard product is global for the time period from 2021-04-01 to present. The NASA TRopospheric Ozone and Precursors from Earth System Sounding (TROPESS) project, uses an optimal estimation algorithm, known as the MUlti-SpEctra, MUlti-SpEcies, Multi-SEnsors (MUSES). The data files are written in the netCDF version 4 file format, and each file contains one day of data. The data have a spatial resolution of 14 km (CrIS nadir FOV), and are reported at 16 vertical levels from the surface to 0.1 hPa. The principal investigator for the TROPESS project is Kevin W. Bowman.

Get the data

trpsdl2pancrs1fs_access.py
import earthaccess
earthaccess.login(strategy="netrc")          # free Earthdata Login

results = earthaccess.search_data(
    short_name="TRPSDL2PANCRS1FS",
    version="1",
    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.