Ammonium nitrate is an odorless crystalline substance that has caused numerous industrial explosions over the decades.

Although ammonium nitrate itself does not burn, as an oxidizer it supports and enhances combustion. When it comes in contact with other combustible materials, the fire hazard is increased.

Now, Caltech researchers have quantified the levels of a component of smog called ammonium nitrate, a molecule that has been notoriously difficult to measure, and have found that there is much ...

Ammonium nitrate is still used in areas like Central Texas that have alkaline soils, because it works better, says Theo Udeigwe, a professor of soil chemistry at Texas Tech University in Lubbock.

A tanker carrying ammonium nitrate flipped on Interstate 81 near Halfway, MD, this morning. Police ask drivers to avoid the area.

The "Ruby," a Malta-flagged cargo ship, is hauling 20,000 tons of ammonium nitrate from Russia's port of Kandalaksha.

Explosives company Dyno Nobel reported the vanishing ammonium nitrate to the federal National Response Center on May 10.

A railcar loaded with more than 60,000 pounds of ammonium nitrate was found empty at a rail stop in the Mojave Desert.

The 'Ruby' picked up ammonium nitrate from Russia's port of Kandalaksha, and docked at the port of Tromsø in Norway.

Thirty tons of a potentially explosive chemical went missing from a sealed train car in April, and no one has any clue where it went.

The explosives company said that it thought the pellets of ammonium nitrate – used to make both fertiliser and explosives – fell from the railcar.