Health effects of exposures to mixtures of air pollutants / Advisory Group on the Medical Aspect of Air Pollution Episodes.

  • Great Britain. Advisory Group on the Medical Aspects of Air Pollution Episodes
Date:
1995
Catalogue details

Licence: Open Government Licence

Credit: Health effects of exposures to mixtures of air pollutants / Advisory Group on the Medical Aspect of Air Pollution Episodes. Source: Wellcome Collection.

    22/140 (page 12)
    Firstly, there is the potential for additive, or possibly synergistic, effects on health from O,; and PM, during photochemical episodes. Secondly, from a control and abatement policy point of view, the particle concentrations in such periods may be significantly influenced by long range, transboundary, transport of sulphate and nitrate aerosols. Table 3.5 Urban network pollutant concentrations (means of hourly averages) during periods with hourly O, concentrations = 90 ppb, 1/1/92 to 31/12/93 Pollutant Concentration * Ratio to period Number of (ppb, unless otherwise mean ** measurements indicated) O, 94 6.7 13 NO, 13 0.5 13 NO, 14 0.2 13 CO 0.5 (ppm) 0.7 iS PM,, 40 (g/m’) 1.6 isan SOs 5 0.5 13 These values are based on available concurrent and co-located measurements ** This ratio is obtained by dividing the mean hourly average concentration of the pollutant (in the previous column by the mean hourly average concentration over the whole period from 1/1/92 to 31/12/93 Figure 3.2 Correlations between hourly average pollutant concentrations in the urban network for 1992-1993. a) Across the whole network in 1992 and 1993, based on 75,982 - 100,231 co-located values; b) London, Bloomsbury site for 1992 and 1993, based on 13,601 - 16,422 values; c) London, Bloomsbury site at periods when the NO: concentration was > 100 ppb, based on 11 - 15 values; d) Belfast centre site for 1992 and 1993, based on 13,505 - 15,448 values. a) b) so, So, PM,, PM,, co co NO, NO, NO, NO, .67 | 0.58 | 0.60 | 0.40 O, -0.23| -0.27 O, .29| -0.03| -0.21 = | O, NO, NO, CO PM, SO, O, NO, NO, CO PM, SO, c) d) so, So, » F&F PM,, co co 84 NO, NO, 0.80 NO, 0.39) 0.13 NO, | ozs 0.56 | 0.59 | 0.64 0, 0.48)-0.45|.0.0 0, | |-062|-047].0.38) 0.2|0.44 O, NO, NO, CO PM, SO, O, NO, NO, CO PM, SO, et r<0.40 r=0.40-0.59 wy r=0.60-0.79 el r>=0.80