CAMS Atmospheric Composition Downloader

Downloads CAMS EAC4 reanalysis data for a single point (lat/lon).

Variables:

• Ozone (O₃) – total column & surface
• Nitrogen dioxide (NO₂) – total column & surface
• Carbon monoxide (CO) – total column & surface
• Sulphur dioxide (SO₂) – surface
• Dust aerosol optical depth – 550 nm
• PM2.5 and PM10 – particulate matter (surface)

Data source:

CAMS global reanalysis (EAC4) – cams-global-reanalysis-eac4 Available: 2003 – Dec 2024 | Resolution: ~80 km | Frequency: 3-hourly / daily

Requirements

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pip install cdsapi xarray netCDF4 numpy pandas matplotlib cartopy rasterio

CDS/ADS API key setup:

1. Register at https://ads.atmosphere.copernicus.eu
2. Create ~/.adsapirc (or set env vars ADS_URL + ADS_API_KEY) url: https://ads.atmosphere.copernicus.eu/api key:

Usage

python cams.py -o download       # fetch NetCDF from ADS
python cams.py -o postprocess    # convert NetCDF → CSV
python cams.py -o visualize      # plot CSV → PNG/PDF
python cams.py -o all            # run all three in sequence