Microbes in the atmosphere (microbial aerosols) play an important role in climate and provide an ecologi-cal and biogeochemical connection between oceanic, atmo-spheric, and terrestrial environments. However, the sources and environmental factors controlling the concentration, di-versity, transport, and viability of microbial aerosols are poorly understood. This study examined culturable micro-bial aerosols from a coastal environment in Maine (USA) and determined the effect of onshore wind speed and fog presence on deposition rate, source, and community compo-sition. During fog events with low onshore winds (<2 m s −1) the near-shore deposition of microbial aerosols (microbial fallout) decreased with increasing wind speeds, whereas mi-crobial fallout rates under clear conditions and compara-ble low wind speeds showed no wind speed dependence. Mean aerosol particle size also increased with onshore wind speed when fog was present, indicating increased shore-ward transport of larger aerosol particles. 16S rRNA se-quencing of culturable ocean surface bacteria and microbial aerosols deposited onshore resulted in the detection of 31 bacterial genera, with 5 dominant genera (Vibrio, Bacillus, Pseudoalteromonas, Psychrobacter, Salinibacterium) mak-ing up 66 % of all sequences. The sequence library from microbial aerosol isolates, as with libraries found in other coastal/marine aerosol studies, was dominated at the phylum level by Proteobacteria, with additional representation from Firmicutes, Actinobacteria and Bacteroidetes. Seventy-five percent of the culturable microbial aerosols falling out under foggy conditions were most similar to GenBank-published sequences detected in marine environments. Using a 97 % similarity cut-off, sequence libraries from ocean surface and fog isolates shared eight operational taxonomic units (OTU's) in total, three of which were the most dominant OTU's in the library, representing large fractions of the ocean (28 %) and fog (21 %) libraries. The fog and ocean surface libraries were significantly more similar in microbial com-munity composition than clear (non-foggy) and ocean sur-face libraries, according to both Jaccard and Sorenson in-dices. These findings provide the first evidence of a differ-ence in community composition and microbial culturability of aerosols associated with fog compared to clear conditions. The data support a dual role for fog in enhancing the fallout of viable microbial aerosols via increased gravitational set-tling rates and decreased aerosolization stress on the organ-isms, which may include relief from UV inactivation, des-iccation, and oligotrophic microconditions. This study pro-vides a strong case for ocean to terrestrial transport of mi-crobes and a potential connection between water quality and air quality at coastal sites.