Coarse Fraction Particle Matter and Exhaled Nitric Oxide in Non-Asthmatic Children.

Only exposure to PM coarse during the previous 24 h period was near statistical significance with an estimated relative change in FENO of 6.3 ppb (95% CI: 0.5; 13.5%) per IQR change in pollutant concentration ( Table 4 ).

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The effect estimates associated with O 3 for the previous 72 h in models adjusted for NO 2 were −6.6 ppb and −6.7 ppb per IQR but these estimates did not reach statistical significance ( Table 5 ).

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