All schools, colleges and educational institutions in Delhi-NCR have been instructed to remain shut until further notice as a result of poor air quality in the national capital region (NCR). Institutions, which were just beginning to open up after remaining closed through the Covid-19 pandemic, will have to revert to the online mode of teaching. br br On Tuesday night, the Commission for Air Quality Management (CAQM) issued a series of directions to the governments of Delhi, Haryana, Rajasthan and Uttar Pradesh to deal with the air pollution crisis in Delhi and neighbouring areas.