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iSPEX map compiled from all iSPEX measurements performed in the Netherlands on July 8, 2013, between 14:00 and 21:00. Each blue dot represents one of the total of 6007 measurements that were submitted that day. At each location on the map, the 50 nearest iSPEX measurements were averaged and converted to Aerosol Optical Thickness, a measure for the total amount of atmospheric particles. This map can be compared to the AOT data from the MODIS Aqua satellite, which flew over the Netherlands at 16:12 local time. The relatively high AOT values were caused by smoke clouds from forest fires in North America, that were blown over the Netherlands at an altitude of 2-4 km. In the course of the day, the northerly winds brought clearer air to the northern provinces.



iSPEX maps compiled from all iSPEX measurements performed in the Netherlands on September 5, 2013, between 7:00-14:00 and 14:00-21:00. Each orange dot represents one of the total of 2444 measurements that were submitted that day. The skies were relatively clear that day. At regional scales, patches of aerosol at ground level are discerned, which are blown in northeast direction. Some of these patches have a probable origin in Germany and France.

(c) American Geophyscial Union / Geophyscial Research Letters

(c) American Geophyscial Union / Geophyscial Research Letters

(c) American Geophyscial Union / Geophyscial Research Letters

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