Work in brief
BRAIN HAEMORRHAGE AND PM7
Environmental concentrations of inhaled particulate matter (PM) can vary rapidly; PM can also affect blood and vagal tone within a matter of minutes. However, little is known about the transient risks to health over such short time frames. Yamazaki et al1 examine the relation between hourly time-lagged concentrations of PM in 13 urban areas of Japan and deaths due to stoke, ascertained from the official records. In case-crossover analysis, the 1-h mean concentration of PM7, measured 2 h before death, was associated with deaths due to intracerebral haemorrhage (odds ratio 2.4 for PM7 ≥200 μg/m3), but not deaths due to ischaemic stroke. An …









