Under the new guidelines, states/Union Territories (UTs) will now categorise Red, Green and Orange zones taking into consideration the parameters shared by the Health Ministry, said the MHA New Delhi: Union Home Secretary Ajay Bhalla wrote to all Chief Secretaries on Sunday evening informing about lockdown 4.0 and the new exemptions while highlighting that the states may be at liberty to restrict the activities allowed in certain areas but they cannot "dilute" restrictions already imposed by the Centre. "I would like to reiterate again that states/Union Territories cannot dilute restrictions imposed vide the aforesaid guidelines issued by the MHA," warned Bhalla.