One out of every five schools in the national Capital does not have the periodic fire safety clearance certificate, according to a review by the Delhi Fire Services which received the highest number of fire-related calls in the past 10 years this Diwali. “At least 20 per cent of the schools in the city — mostly the ones run by the Government or municipal corporations — have failed to fulfill the safety requirements,” Director of Delhi Fire Services AK Sharma said. Sources said the department is likely to prepare a list of schools which have failed to fulfill safety requirements despite being intimated several times, and will issue them notices soon.