When you unwrap a box of fireworks on Diwali day, check for two things - the chemical composition of the fireworks and a disclaimer on sound emissions. Both are mandatory. If they are absent from the packet, the fireworks have not been manufactured by a government-licensed unit. They either have been made illegally or are of Chinese origin, and may not abide by the Explosive Act and sound limits prescribed by the government.
An industry source said major players in Sivakasi display the chemical composition on the packets. In addition to that, the disclaimer on sound emission is also printed, the source said. Petroleum and Explosives Safety Organization (PESO) in Sivakasi has derived a formula for fireworks to keep the sound emitted under 125 decibels.

Tamil Nadu Fireworks and Amorces Manufacturers' Association (TANFAMA) former president G Abiruben said Fireworks Research & Development Centre (FR&DC), Sivakasi under PESO had been testing random samples of all 800 licensed firework units in Sivakasi.....Read more

Source web page:Times of India