I would willingly accompany Ron Johnson (Noxious Emissions Rife On The Roads, June 17) in his anti-pollution vigil. Please name the time and the place, I'm sure The Times will oblige with my details too.

For all the postulating and spin doctoring, the emission alert figures are only the percentage of the population who care enough to report a smoking vehicle. The math simply doesn't work does it?

Although advised not to cycle in polluted traffic, I'm still able to use my motorcycle and although now no longer open faced teeth in the wind (and bugs), suitably equipped with a visor, I whizz past all the poor tin boxes stuck in traffic.

Now while you dear reader see the back end of say 15 to 20 vehicles in your daily grind to work, I see far more and you won't believe the percentage of smoking exhausts!

So Mr Johnson and I can sit ticking off smoking vehicles and rest assured it would be a very high number. But without robbing Mr Johnson of any fire, what good would it do in the current legal apathy? Given that often all that is needed is for the fuel metering to be adjusted or the diesel pump tuned, isn't it about time emissions became part of the annual VRT or will we just get more ADT spin?