"Some airborne organic compounds, such as benzene, which increase the risk of cancer, have been recorded at petrol stations at above the average levels for urban areas where traffic is the primary source of emission," said Doval.
The team measured the levels of 'typical traffic' pollutants in different parts of Murcia, and calculated the quotients for the levels of an aromatic compound (benzene) and a hydrocarbon (n-hexane) at three petrol stations, according to a Murcia university statement.
"In the three cases, we obtained maximum distances of influence of close to 100 metres, although the average distance over which this contamination has an effect is around 50 metres," said researcher Enrique González.
However, the distances depend on the number of petrol pumps, the amount of fuel drawn from them, traffic intensity, structure of the surroundings, and weather conditions.