The Saharan dust carried by Scirocco winds bring “Blood Rain” to Europe. Other winds carry this dust to other parts of the world. A 2015 study has unambiguously established that the cause of blood rain in Kerala was the aerial spores of green Microalgae Trentepohlia. This is the case elsewhere as well.
Sources: BAST, F, BHUSHAN, S., JOHN A.A., ACHANKUNJU, J., PANIKKAR N.M.V., HEMETNER, C., AND STOCKER-WÖRGÖTTE, E. 2015 European Species of Subaerial Green Alga Trentepohlia annulata (Trentepohliales, Ulvophyceae) Caused Blood Rain in Kerala, India. J Phylogen Evolution Biol 3: 144
Contributed by Haseeb Ahmed