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The Kerala red rain phenomenon was a blood rain (red rain) event that occurred from 25 July to 23 September 2001, when heavy downpours of red-coloured rain fell sporadically on the southern Indian state of Kerala, staining clothes pink.Yellow, green, and black rain was also reported. Coloured rain was also reported in Kerala in 1896 and several times since, most recently in June 2012,and from 15 November 2012 to 27 December 2012 in eastern and north-central provinces of Sri Lanka.

Following a light microscopy examination in 2001, it was initially thought that the rains were coloured by fallout from a hypothetical meteor burst,but a study commissioned by the Government of India concluded that the rains had been coloured by airborne spores from a locally prolific terrestrial green alga from the genus Trentepohlia. An international team later identified the exact species as Trentepohlia annulata.

Source:Wikipedia