Letter: Ozone-friendly but nostril-hostile

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I HAVE always wondered how anyone can seriously state that catalytic converters on cars could improve air quality. Yesterday, I again had to suffer the stench of rotten eggs as the car in front of me at a set of traffic lights pulled away, leaving the smell of its 'ozone-friendly cat' in its wake.

Your article ('City air pollution 'will get worse' ', 13 December) has confirmed my thoughts.

Barbara Bechtloff

London E17