All about firecrackers, their composition and health hazards.
source https://timesofindia.indiatimes.com/city/delhi/lights-sound-chemical-reaction-facts-about-diwali-firecrackers/articleshow/87532059.cms
source https://timesofindia.indiatimes.com/city/delhi/lights-sound-chemical-reaction-facts-about-diwali-firecrackers/articleshow/87532059.cms
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