Ludhiana, Nov. 12 -- The Punjab government's order allowing only the use of green firecrackers on Diwali and Gurpurab has posed a challenge in front of the police, administration and even customers - distinguishing the eco-friendly variety from the traditional ones.

Having come into prominence last year, green fireworks carry a QR code and a "green firework" label. However, with the standard not being followed by manufacturers invariably, traders say they neither have adequate eco-friendly stock nor are sure of differentiating between the two kinds.

According to the department of science, technology and environment, Punjab, only firecrackers without barium salts or compounds of antimony, lithium, mercury, arsenic, lead and strontium chrom...