THE LPG Association's research document, called 'A Bridge to the Future', argues that gaseous fuels still provide environmental benefits compared to petrol and diesel, despite recent advances in engine technology that have made traditional fuel engines much cleaner.

The research showed that particulates, which have been linked to respiratory disease, were 120 times lower in autogas vehicles compared to diesels on the urban cycle.

Nitrous oxides, another harmful pollutant, were between 120% and 180% higher in petrol cars than autogas vehicles, while in diesels, emissions were 2,000% higher. The research also claimed CO2 emissions, when measured well-to-wheel (which includes emissions during production of the fuel), were 20.3% higher for petrol and 1.8% higher for diesel.

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