The SLSTR Level-2 AOD product is generated and maintained by EUMETSAT. It has been released in the second half of 2020.
Detailed description of this product and of SLSTR AOD algorithm can be found on: https://www.eumetsat.int/S3-AOD
Note: The SLSTR L2 AOD product is generated by EUMETSAT in NRT only. An offline (NTC) AOD product is generated from SYN data by ESA, exploiting the synergy between the SLSTR and OLCI instruments.