HAT AN an uphill struggle your environment correspondent Geoffrey Lean faces. After reading his excellent article "Where did all the fresh air go?" (Sunday Review, 5 March), I subsequently found that the true answer lay on pages 10 and 11 - a double-page advertisement for a nitrogen dioxide spewing, sulphur dioxide emitting, benzene discharging, carbon monoxide circulating, particulating Mercedes Benz, in which no mention was made (assuming any exists) of its lesser impact on the environment than any other make.

Perhaps in light of Mr Lean's article we will see no more motor car advertisements in your newspaper, or at least no more Alfa Romeos (or any other motor car) offered as a prize by the Independent to its readers.

Robert Pringle

London N4