When analysing for the presence of asthma, asthmatic subjects showed correlations between FEV 1 and 24 hour average outdoor air pollution levels which just failed to reach statistical significance (Spearman's rho -0.187, p = 0.06), while non-asthmatic subjects showed no significant correlations.
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The effect of ambient air pollution on respiratory health of school children: a panel study.
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The sentences
Differences in 1-OHP levels between the two control days did not reach statistical significance.
However, wood and other organic matter combustion may be significant source of exposure in areas burning solid fuel for domestic heating, such as Canada and the North West USA, Scandinavia, and New Zealand.
Indeed there is an increasing trend for wood to be used as a source of home heating in the New England states and in upstate New York.