Table 5. Odds ratios (ORs) and 95% CIs for respiratory diseases associated with ambient air pollutants (2006–2008)^a .

Symptom	Pollutant	All subjects		Boys		Girls
		ORb	95% CI	ORb	95% CI	ORb	95% CI
Persistent cough	PM10	1.23	1.07–1.42	1.06	0.88–1.29	1.44	1.18–1.77
	SO2	0.89	0.75–1.25	0.89	0.73–1.08	0.77	0.63–1.04
	NO2	1.10	0.96–1.26	1.18	0.98–1.43	1.02	0.84–1.24
Persistent phlegm	PM10	1.20	0.98–1.46	1.05	0.80–1.39	1.36	1.02–1.81
	SO2	0.86	0.70–1.05	0.94	0.71–1.24	0.78	0.59–1.04
	NO2	1.00	0.82–1.22	0.99	0.74–1.32	1.03	0.78–1.36
Asthma symptoms	PM10	1.02	0.87–1.21	0.95	0.76–1.18	1.13	0.87–1.46
	SO2	1.10	0.93–1.32	1.15	0.91–1.45	1.05	0.80–1.37
	NO2	1.16	0.98–1.38	1.20	0.96–1.51	1.11	0.86–1.45
Current asthma	PM10	1.10	0.85–1.42	1.06	0.77–1.45	1.14	0.73–1.78
	SO2	1.03	0.79–1.34	0.96	0.68–1.34	1.16	0.75–1.78
	NO2	1.21	0.93–1.57	1.14	0.82–1.57	1.33	0.86–2.07
Wheezing	PM10	1.35	1.15–1.57	1.37	0.91–1.70	1.31	1.04–1.65
	SO2	0.83	0.71–0.96	0.83	0.68–1.03	0.83	0.70–1.04
	NO2	0.96	0.82–1.12	0.90	0.73–1.12	1.04	0.83–1.30
Allergic rhinitis	PM10	0.97	0.76–1.25	1.14	0.80–1.62	0.82	0.57–1.19
	SO2	1.29	0.96–1.73	1.15	0.78–1.70	1.52	0.95–2.44
	NO2	1.55	1.17–2.04	1.29	0.89–1.86	1.96	1.27–3.02

^aSingle-pollutant models adjusted for personal and environmental factors. Models for all subjects are adjusted for variables with superscripts in Table 3.

^bORs are scaled to the interquartile range for each pollutant (ie, 31 µg/m³ for PM₁₀, 21 µg/m³ for SO₂, 10 µg/m³ for NO₂). Three models were fit for each symptom or condition, 1 for each pollutant.

PM₁₀, particles with an aerodynamic diameter ≤10 µm; SO₂, sulfur dioxide; NO₂, nitrogen dioxides.