Mango wood is the major ingredient used in havan . Mango wood is sustainable because mango trees capture carbon from the atmosphere,Mango wood burnt after pouring pure ghee does not cause pollution. We are also adding sesame seeds, rice and barley to aid the purification process... nothing else to say bro ( Says GOOGLE )
You can easily see the pollution during Havan but that's not the actual problem . There's nothing special in mango wood. Even if it is , but the carbon capturing will make it even worse in for burning it will cause much more CO2 production. You can still perform havan but yeah!!!! It's not scientific at all