Ammonium nitrate is an industrial chemical commonly used in fertilisers and as an explosive for quarrying and mining. It is an oxidiser considered relatively safe if uncontaminated and stored properly. But it is extremely dangerous if contaminated, mixed with fuel or stored unsafely. A large quantity of ammonium nitrate exposed to intense heat can trigger an explosion. Storing the chemical near large fuel tanks, in bulk in large quantities and in a poorly-ventilated facility could cause a massive blast. The larger the quantity, the more risk it will detonate.
