PANJIM: Goa’s 16 major private and public sector companies in the field of power generation, steel production, liquor, fertilizers and pharmaceuticals were issued show cause notices on Thursday by Goa State Pollution Control Board for failing to install online stack emission, effluent and ambient air quality monitoring system.

GSPCB Member Secretary Levinson Martin who issued the notices, has asked the companies to reply within 15 days, failing which action would be taken to close the units. The Board has said that in letters dated April 21, 2011, August 8, 2011 and January 10, 2012 the companies were directed to take immediate measures for installation of the system by June 2012, but they failed to act.