Air Pollution from Small Particulates

The Mayor of London, Sadiq Khan, has released new research giving the emissions of toxic particles known as PM2.5. He claims most Londoners are exposed to levels that exceed WHO guidelines. Here’s a summary of the report:

The research, based on the latest updated London Atmospheric Emissions Inventory, shows that 7.9 million Londoners – nearly 95 per cent of the capital’s population – live in areas of London that exceed the guidelines by 50 per cent or more.

PM2.5 are small toxic air particles which are alleged to have the greatest impact on health with both short and long-term exposure increasing the likelihood of respiratory and cardiovascular diseases. Children are particularly affected and may develop reduced lung function and asthma.

Around half of PM2.5 emissions in London are from external sources outside the city, however, the main sources of PM2.5 emissions in London are from tyre and brake wear, construction and wood burning.

The Mayor is clear that he wants to reduce emissions from wood burning through improved education about the types of fuel that should be used and when they should be used. He also wants a stricter set of emission standards on future sales of wood burning stoves to tackle this problem.

Comment: Why anyone should be permitted to use a wood-burning stove in central London when most people think such usage was banned under the Clean Air Act rather surprises me. But a lot of the particulate emissions are from construction in London, or are blown in from outside – and much of those are from agriculture, or even pollution from other countries. It is not at all clear how the Mayor is going to tackle these, but dust from tyre and brake wear is more easily controlled. Whether this would have a significant impact overall, or are cost effective measures, is not obvious though. Unfortunately this looks like political posturing by the Mr Khan, using children as his cheer leaders in this campaign.

Regrettably such pollution is mainly a symptom of over population, which Mr Khan and his predecessors seem not to want to do anything about.

Roger Lawson

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