I needed a safe and quiet "bubble" for overnight having landed in Kolkata and on my way to IIT Kharagpur. Fortune Hotel was perfect for this. A taxi picked me up at the airport -- it is a 45 minute drive. Next day he returned to take me the rest of the way (2+ hours). You do not escape all of the Kolkata pollution, but it is a bit better -- and inside it was fine. The surrounding area outside the bubble is slums, but you are very "far" away -- no traffic, no noise at all. Mosquitoes outside at dusk are very bad, but daytime and inside were fine. I had dinner in the hotel restaurant and it was very good. I highly recommend the Fortune hotel for this purpose.