"The air pollution level kept fluctuating even after the prescribed period of ban on trucks. It has been extended till further orders and a notification to this effect has also been issued," the official said. 

The notification has asked the Delhi Traffic Police and the Municipal Corporations of Delhi to prohibit the entry of heavy and medium goods vehicles, except those carrying essential commodities, in the national capital. 

As per the Graded Response Action Plan(GRAP) implemented in Delhi, the ban on entry of truck in Delhi comes into force when PM2.5 levels cross 300 microgramme per metre cube and PM10 levels rise over 500 microgramme per metere cube.

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