[quote=ChrisConvertible]
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Burning hydrogen as a replacement for petrol in an ICE will produce pollutants such as NOX so probably not an ideal solution. You may as well try to continue to run classics on petrol.
The next issue waiting in the wings will be an investigation into all the dust, micro particles, & crud we can inhale from car tyres & brakes continually wearing & being thrown into the air, DEFRA has suggested that it could be a larger public hazard than exhaust emissions
It is.
In my previous working life I was involved in the supply of Certified Reference Materials used in calibrating analytical methods. The EC, through the JRC in Geel, issued a CRM produced from the material washed off the inside of one of the alpine tunnels. It contained a remarkably toxic mixture of organic, petrochemical and trace element pollution, much of it was from diesel truck exhausts (this was in the late 1980s).
To be honest I wouldn't drive any open car through the tunnels on a regular basis: this was BEFORE the concerns about micro particulates and other materials of recent concern.
Electric vehicles will cause less micro particulate pollution, as the use of brakes is significantly reduced due to regenerative braking.
