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This study investigates the effects of the total solar eclipse of 29 March2006 on surface air-quality levels over Greece based on observations at anumber of sites in conjunction with chemical box modelling and 3-Dair-quality modelling. Emphasis is given on surface ozone and otherphotooxidants at four Greek sites Kastelorizo, Finokalia (Crete), Pallini(Athens) and Thessaloniki, which are located at gradually increasingdistances from the path of the eclipse totality and are characterized bydifferent air pollution levels. The eclipse offered the opportunity to testour understanding of air pollution build-up and the response of thegas-phase chemistry of photo-oxidants during a photolytical perturbationusing both a photochemical box model and a regional air-quality offlinemodel based on the modeling system WRF/CAMx. At the relatively unpollutedsites of Kastelorizo and Finokalia no clear signal of the solar eclipse onsurface O3, NO2 and NO concentrations can be deduced from theobservations while there is no correlation of observed O3, NO2 andNO with observed global radiation. The box and regional model simulationsfor the two relatively unpolluted sites indicate that the calculated changesin net ozone production rates between eclipse and non eclipse conditions arerather small compared to the observed short-term ozone variability.Furthermore the simulated ozone lifetime is in the range of a few days atthese sites and hence the solar eclipse effects on ozone can be easilymasked by local and regional transport. At the polluted sites ofThessaloniki and Pallini, the solar eclipse effects on O3, NO2 andNO concentrations are revealed from both the measurements and modeling withthe net effect being a decrease in O3 and NO and an increase inNO2 as NO2 formed from the reaction of O3 with NO while atthe same time NO2 is not efficiently photolysed. This result is alsosupported by a positive correlation of observed global radiation with O3 and NO and a negative correlation with NO2. It is evident from the3-D air quality modeling over Greece that the maximum effects of the eclipseon O3, NO2 and NO are reflected on the large urban agglomerationsof Athens, and Thessaloniki where the maximum of the emissions occur

Effects on surface atmospheric photo-oxidants over Greece during the total solar eclipse event of 29 March 2006