Pollution control is a science and technology based activity. For effective measures to prevent and control, it is necessary to develop scientifically sound, user-friendly tools and methodologies. For planning and priority setting in regard to pollution problems, scientific data base and technologies can be developed through sustained R & D initiatives. Hence, as a pre-requisite for its enforcement activities, the Central Pollution Control Board (CPCB) has undertaken R & D projects on its own and also in collaboration with specialized institutions.

The present issue of `Parivesh' deals with the various research projects of the Central Pollution Control Board including relevant technical data generated out of the research studies. The information contained in this issue has been collated by my colleagues Dr. C. S. Sharma, Senior Scientist; Sh. A. Manoharan, Scientist `C'; Dr. S. D. Makhijani, Additional Director and Dr. B. Sengupta, Member Secretary. I am grateful to Dr. K. R. Ranganathan for his critical review and suggestions on the background papers prepared for this issue of Parivesh.

We hope, the information on the R & D Projects will be useful to the researchers and others concerned with pollution control activities.

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