Explanation:

• The CSIR-National Environmental Engineering Research Institute (CSIR-NEERI) is a research institute created and funded by Government of India.
• It was established in Nagpur in 1958 with focus on water supply, sewage disposal, communicable diseases and to some extent on industrial pollution and occupational diseases found common in post-independent India.
• NEERI is a pioneer laboratory in the field of environmental science and engineering and part of Council of Scientific and Industrial Research (CSIR). Hence statement 1 is correct.
• NEERI has five zonal laboratories at Chennai, Delhi, Hyderabad, Kolkata and Mumbai. NEERI falls under the Ministry of Science and Technology (India) of central government and is headed by the Prime Minister as the President and the Minister of Science and Technology as the Vice-President. Hence statement 2 is not correct and statement 3 is correct.
• NEERI's Vision: Leadership in Environmental Science and Engineering for Sustainable Development.
• NEERI's Mission: CSIR-NEERI would continue to strive for providing innovative and effective solutions for environmentally sustainable development and to help Government, industry and the society, especially the 800 million underprivileged people of India.
• The NEERI is an important partner organisation in India's POPs (persistent organic pollutants) national implementation plan (NIP). 
• CSIR-NEERI has successfully transferred two technologies, viz. Phytorid wastewater treatment technology to 15 MSME entrepreneurs and Solar Electrolytic Defluoridation technology of water to 9 MSME entrepreneurs.
• CSIR-NEERI has developed indigenous “Electronic Nose (e-nose)”, in association with C-DAC Kolkata, which has a potential to substitute imported “e-nose”. This e-nose consisting of 8 array of sensors (metal oxide) is useful in monitoring of sulphurous odorants in pulp & paper industry, tannery and distillery.
• It has also setup emission testing rules for green crackers.