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What is Tropospheric Ozone Enhancement – 002

Image captured by Moderate Resolution Imaging Spectroradiometer (MODIS) from NASA’s Aqua satellite on the afternoon of June 19, 2013. The red spots mark areas where the thermal sensors on the MODIS instrument have detected temperatures higher than background.
Source: http://earthobservatory.nasa.gov/IOTD/view.php?id=81431