The Times of India. Ranchi's district disaster management authority has mandated firecracker sellers to adhere to safety norms for Diwali. Sellers must obtain permits, sell crackers below 125 decibels, and ensure. Jharkhand Pollution Control Board has limited firecracker usage to 8 pm-10 pm on Diwali, with penalties for violations. While sale of low-decibel crackers is permitted in areas with good air.