4-years extension of time series, to contribute to the NDSC and to the assessment of Montreal and Kyoto protocols:

• O₃, NO₂, and O₃ depleting gases;
• Radiatively active gases (CO₂, CH₄, N₂O, SF₆ ...);
• Sources and tropospheric species: CFC, HCFC, CO, H₂CO...;
• Spectral UV irradiance measurements at Ukkel by BIRA and KMI.

More performant data analysis algorithms:

• Vertical profile information: tropo-versus stratosphere;
• Extraction of aerosol information.

Exploitation of new observations:

• New methods (off-axis DOAS) for detection of tropospheric gases (formaldehyde, BrO, ...);
• New site: UV-VIS DOAS at Ile de la Réunion (22°S, 55°E).

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