Polycyclic aromatic hydrocarbons (PAHs); chemicals in plastics like bisphenol A (BPA); Parabens & phthalates in cosmetics; heterocyclic amines (HCAs) in meat cooked at high temperatures; metals like arsenic, nickel and chromium; asbestos, tar and soot; pesticides, fertilizers, chemicals in sunscreen; gases like sulphur oxide; carbon monoxide; nitrogen dioxide and nitrogen oxide increase the risk of cancer.