To ask the Secretary of State for Health, pursuant to her answer of 7 June, Official Report, columns 43–44, whether levels of PM10 particulate found in the United Kingdom are within the range of those found in United States studies demonstrating an association between PM10 levels and mortality; and what assessment she has made of whether the speciation of PM10 is comparable between the two countries.
I have been asked to reply.Of the studies referred to in the reply to the answer of 7 June, the study in the Utah valley was the only one concerned with PM
10 particulate pollution. The concentrations of PM10 measured in that study were, overall, higher than those measured to date in the United Kingdom. The mean PM10 value in the Utah valley study was 47 µg/m3 while the means in the six United Kingdom cities in 1992 for which data are available ranged from 22–31 µg/m3 . The highest daily value measured in the Utah valley study was 355 µg/m3 , while the corresponding United Kingdom values ranged from 72–228 µg/m3 .