Dear Viswamitra Sir, Thank you for coming in and adding few more valuable inputs in this. Its always great to hear from people like you who are living / applying those concepts. Adding your experience here will definetly boost the knowledge about Green Buildings. Thank you so much sir for letting us know about this - "photo catalytic oxidation equipment" I did nt knew about it. will do some research on it for sure. And the Boston government's new rule is definetly commendable. And In Newzealand they even provide special loans for the construction Green buildings. Hope such practice comes in India and encourages builders & individual house holds for Green buildings.