Particulate matter (tiny particles) with a diameter of less than 10 microns is a common component of motor vehicle exhaust. In a study involving 2080 people, 870 of whom had developed blood clots in the legs (deep vein thrombosis or DVT), Italian researchers found that the risk of developing DVT  increased by 70% for each increase of 10 micrograms per square meter in air particulate matter concentration. In addition, people with higher exposure to particulate matter had the fastest blood clotting times.

Particulate matter (tiny particles) with a diameter of less than 10 microns is a common component of motor vehicle exhaust. In a study involving 2080 people, 870 of whom had developed blood clots in the legs (deep vein thrombosis or DVT), Italian researchers found that the risk of developing DVT  increased by 70% for each increase of 10 micrograms per square meter in air particulate matter concentration. In addition, people with higher exposure to particulate matter had the fastest blood clotting times.

Italian researchers have found that electromagnetic fields produced by incubator motors can reduce the normal heart rate variability in newborn babies.

A report in the New York Times has described how some New York and New Jersey residents fear that lead, which is an ingredient in the green pigments used to colour some artificial grasses, may cause adverse health effects in children who play on these synthetic surfaces.