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There are 7 clues with the answer 'NITROGENDIOXIDE'
# CLUE
1.
Region died: toxin released poisonous gas (8,7)
2.
Nasty automobile exhaust gas
3.
Pollutant in engine exhaust
4.
Explosive information: made energy absorbing one cow's smelly gas (8,7)
5.
Sharp-smelling air pollutant
6.
Gas produced by auto engines
7.
Nasty exhaust gas