The Observer, 2 January 2020:
Local authorities should be congratulated for banning vehicles from city centres (“Is this the end of the road for cars in Britain’s cities?”, Focus). Diesel vehicles are a particular problem as they generate ultra-fine particles, which are the most dangerous biologically. It had been assumed that diesel emissions would become less of a problem with the introduction of stricter emission standards, but recent testing has shown that diesel filters emit a huge number of ultra-fine particles when the filter is automatically decoked every 300 miles. Pressure from car manufacturers has ensured that these emissions are not included in EU vehicle emission tests.
Evidence as to the health impact of air pollution is also accumulating. A recent study showed that academic performance improved after air filters were fitted to schools in Los Angeles, providing key evidence of a causal link. After Brexit we will no longer be protected by EU air quality standards, and the government’s forthcoming environment bill is a poor substitute for EU law. We urgently need a new clean air act, and a national clean air agency to enforce it.
Dr Robin Russell-Jones, scientific adviser, all-party parliamentary groups
Geraint Davies MP, chair, all-party parliamentary group on air pollution
House of Commons, London W1A