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Thorax 58:1012-1015 doi:10.1136/thorax.58.12.1012
  • Editorial

Hypothesis: Ill health associated with low concentrations of nitrogen dioxide—an effect of ultrafine particles?

Table 1

Pearson correlation coefficients for the logged daily outdoor concentrations of NO2, NO, particle numbers, PM2.5 and PM10 in Aberdeen

Particle numbers PM2.5 PM10
Each box gives correlation coefficient and number of daily observations. All correlations were significant at p<0.001.
No of particles <200 nm diameter 0.56 (n = 124) 0.40 (n = 121)
Nitric oxide (NO) 0.86 (n = 115) 0.45 (n = 121) 0.39 (n = 117)
Nitrogen dioxide (NO2) 0.89 (n = 115) 0.55 (n = 121) 0.45 (n = 117)

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