The Greater Noida authority said on Tuesday (27 October) it has deployed 224 anti-smog guns at construction sites and launched water sprinkling drives. The Greater Noida authority said on Tuesday (27 October) it has deployed 224 anti-smog guns at construction sites and launched water sprinkling drives to keep dust down, as the Graded Response Action Plan (GRAP) remains in force across the National Capital Region (NCR).