The activists managed to sneak inside the premises of the Kolaghat Thermal power plant in Midnapore District and climbed on to the 230 feet chimney of the thermal power station and wrote 'Smoking Kills' on the chimney.
Later the plant's internal security personnel detained the activists.
"Clearly message is smoking kills, and just like normal smoker who smokes and kills not only himself but also other people in the room. The smoke that is here not only affects people around but also keeps increasing the environment temperature especially because it is coal fire," said Saumyabrato Rahul, an activist of the environmental group.
"The need (of the hour) is de-carbonisation path that should be taken by the government, which will not only give them energy security but will also secure the lives of millions of people who live in India," he added.
The activists said that they are ready to court arrest or face legal action for their act as long as the message against environmental pollution was conveyed