Green crackers produce significantly less smoke and harmful gases, like sulphur dioxide and particulate matter (PM2.5), major contributors to pollution. They produce less noise and are made from eco-friendly oxidisers, with reduced aluminium sulphur and no barium. Normal firecrackers have high levels of particulate matter, SO₂ and NO₂. They are made of gunpowder, barium, Sulphur and heavy metals.