ERS-2 was almost identical to its sister satellite ERS-1, but it had one new instrument, the Global Ozone Mapping Experiment (GOME), providing information on not only atmospheric ozone but also other trace gases and aerosols. Its deployment made possible the first European space-based ozone monitoring. This image shows a plot of the total column amount of ozone measured during one day. GOME results are being used operationally in the Tropospheric Emission Monitoring Information Service (TEMIS), providing ozone and ultraviolet radiation levels forecasting.