Dirty air and babies

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The Times, 15 March 2019:

Sir, One neglected aspect of air pollution is its effect on birth weight (“Air pollution kills more people than boasting about freezing the fuel smoking”, Mar 13). A meta-analysis of 32 studies linking birth outcomes with the level of small particulates (PM2.5) concluded that each increase of 10g/m3 in PM2.5 lowers birthweight by 16 grams. Living in central London while pregnant is thus equivalent to smoking one cigarette a day.

In 2017 researchers from King’s College London showed that reductions in birth weight were tied more closely to exhaust emissions than to other types of particulates generated by traffic (eg, wear and tear on brakes and tyres) and not at all to noise pollution. During the Olympic Sir, Alice Thomson (Comment, Mar Games in 2008, the Chinese government made every effort to reduce pollution levels in Beijing, and birth weight increased. The maximum benefit was for women in the eighth month of pregnancy, a period of maximum foetal growth.

Low birth weight is important because it is linked to a host of adverse outcomes in later life, including lower IQ. The British government could do far more to mitigate these effects. Instead of boasting about freezing the fue escalator for the past nine years, the chancellor should increase the tax on diesel, introduce a diesel scrappage scheme and bring forward the phase-out date for fossil fuel vehicles from 2040 to 2030.

Dr Robin Russell-Jones, FRCP, FRCPath, scientific adviser to the all-party parliamentary group on air pollution

Geraint Davies, MP
chairman, APPG on air pollution

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