Construction Drivers Exposed to Significant Black Carbon Diesel Emissions

RESEARCH by King’s College London, funded by the Institution of Occupational Safety and Health (IOSH), shows that professional construction drivers are exposed to significant levels of black carbon when driving in congested cities.

Breathing in black carbon can cause cancer.

Some drivers are exposed to black carbon levels which are on average a third higher than would be experienced at a busy roadside or nearly four times the amount per cubic metre than at home.

Simple protection

However, the study suggests that professional drivers can take simple steps to protect themselves from pollution, such as driving with their windows closed.

The research was presented by Shanon Lim, a research assistant and PhD candidate at King’s College London, UK. It was a collaboration between researchers at King’s and researchers at Queen Mary University of London.

Shanon Lim said: “There has been surprisingly little research on levels of professional drivers’ exposure to pollution and its effects on their health. We believe there are around a million people working in jobs like these in the UK alone, so this is a widespread and under-appreciated issue.”

The researchers recruited 140 professional drivers from a range of occupations working in central London. The drivers were asked to carry black carbon monitors, which were linked with GPS trackers, for a period of 96 hours. The monitors measured exposure levels once every minute. Drivers were also asked about the type of vehicle they drive, their working hours and whether they drive with their windows or air vents open.

Home and work

The results showed that, on average, professional drivers were exposed to 4.1 micrograms of black carbon per cubic metre of air (µg/m3) while driving, which was around four times higher than their exposure at home (1.1 µg/m3). Researchers say the levels recorded at home are similar to levels experienced by office workers at their desks.

Professional drivers also experienced extremely high spikes in exposure to black carbon, often exceeding 100 µg/m3 and lasting as long as half an hour.

During the same period of time, researchers found that pollution levels at a busy London roadside (Marylebone Road) were 3.1 µg/m3 on average and, away from the roadside, the average level in London was 0.9 µg/m3.

Taxi drivers had the highest levels of exposure on average (6.5µg/m3). Emergency services workers had the lowest levels of exposure on average (2.8 µg/m3).

Soot particles

Diesel fumes can contain up to 10 times the amount of soot particles than in petrol exhaust fumes, and can cause cancer. The Institution of Occupational Safety and Health’s No Time to Lose campaign to tackle occupational cancer has focused on diesel engine exhaust fumes and has provided guidance on its impact and how to reduce exposure.

Shanon Lim said: “Our study suggests that professional drivers are exposed to high levels of traffic pollution while at work. Because these levels are higher than those we find at the roadside, this suggests that being inside a vehicle doesn’t necessarily offer any protection, in fact the opposite may be true: that air pollution can get trapped inside the vehicle for extended periods of time.

The research also showed that keeping windows closed while working halved the levels of black carbon for professional drivers. The type of vehicle and the choice of route could also lower exposure.

The researchers will continue to study the data they have gathered. They also plan to investigate possible strategies for protecting drivers, such as the use of air filters. “This is vital to help employers, occupational safety and health professionals and individual workers reduce exposure and minimise work-related health risks,” said Shanon Lim.

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