G. Kumar fulfilled a STSM at Rome, IT. He implemented a method to retrieve nighttime/lunar AOD , from PREDE sunphotometer and then compared the results with the colocated CIMEL. Good agreement was found, making the method suitable for operational use. Cloud screening of nighttime measurements was also applied, which appeared to be very strict and filtered out the majority of the data. Future work should focus on more effective approaches on cloud screening.