He discovered the cause of red rain and studied the health hazards of mobile phone towers; and soft drinks like colo, pepsi etc; eco-biology of sacred groves; and environmental effects of sand, rock, clay mining, plastic and pesticide pollution.
The telecommunication department in Kerala has constituted a committee to study health hazards and suggest measures in the light of his research works.
Sainudeen Pattazhy became popular for his study on the red rain phenomenon in Kerala in recent years, particularly 2001.
His research proved that the red colour of the rains were due to a geological process and had nothing to do with alien life.
He has got published 200 research papers in different national and international journals, including those in the USA, UK and Australia.