Nitrogen trichloride makes swimming pools smell and is a good indicator of plenty of pee.
The Assad government is accused of using chlorine gas as a weapon against its own people.
Unlike the U.S., some European countries have stopped using chlorine to disinfect drinking water to avoid changing the taste and potential health problems. Which approach is better?
A century since chlorine gas was used at Ypres, beginning the era of chemical weapons, controlling lethal agents is harder than ever.
Sheets of silk dipped in chlorine have been found to quickly kill off almost all bacteria, including the armoured spores…