1,3-Butadiene is a gas and like benzene is another hydrocarbon.

All of the UK's, 1,3-Butadiene is produced from human activities, the majority coming from motor vehicle emissions.

Needless to say, 1, 3-Butadiene concentrations are highest in urban areas with lots of motorised traffic and lowest in rural areas.

1, 3-Butadiene concentrations are greatest in the and lowest in the summer months.

And of course 1,3-Butadiene is also a carcinogenic.

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