Air pollution from traffic puts unborn babies at health risk
London, Dec 7- Pregnant women exposed to air pollution from road traffic are more likely to give birth to babies that are underweight or smaller than they should be, a study conducted in the UK warns. However, when it comes to traffic-related noise, the study of more than half a million infants, published in The BMJ, found no conclusive effect on babies' health. Cutting the average concentration of fine particle pollution emitted by London's road traffic by just 10 per cent could prevent around 90 babies a year (three per cent of cases) being born with low birth weight. The findings led by researchers at Imperial College London could be applicable to other cities in the UK and across Europe with comparable levels of road traffic pollution, highlighting the need for environmental health policies to improve air quality in urban areas. Previous studies have shown a link between air pollution, pregnancy complications and childhood illness, but studies of noise pollution in pregnancy have provided conflicting results. The latest study looked at the link between exposure to air and noise pollution from road traffic during pregnancy and the effect on measures of birth weight – both low birth weight (less than 2,500 grammes) and being born small for gestational age. The study focused on records of more than half a million (540,365) babies born in the Greater London area between 2006 and 2010, along with the mother's home address location. Researchers estimated average monthly concentrations of pollutants related to road traffic, including nitrogen dioxide (NO2), and fine particulate matter (PM2.5) from traffic exhaust and non-exhaust sources, such as brakes or tyre wear, as well as larger particulate matter (PM10). Average day and night-time road traffic noise levels were also estimated.
