. 2023 Aug 18;131(8):087012. doi: 10.1289/EHP12066

Table 3.

Baseline (2006) exposures to air pollutants and objectively tested olfaction (2018–2019) among participants with a stable residential history.

Exposures	Living $greater than or equal to 10$ y at enrollment address^a		Not moving since enrollment^b
Exposures	Normal/poor olfaction	OR (95% CI)^c	Normal/poor olfaction	OR (95% CI)^c
$particulate matter begin subscript 2.5 end subscript$ [ ${μ g / m}^{3}$ (min, max)]
Quartile
Q 1 (2.60, 8.52)	317/122	Ref	355/144	Ref
Q 2 (8.53, 10.47)	341/134	0.95 (0.67, 1.34)	355/165	1.12 (0.81, 1.55)
Q 3 (10.48, 11.84)	342/154	1.14 (0.79, 1.65)	366/158	1.09 (0.77, 1.54)
Q 4 (11.84, 19.91)	303/149	1.23 (0.84, 1.78)	321/157	1.19 (0.83, 1.69)
Per IQR ( $3.3 micrograms per meter cubed$ )	—	1.07 (0.90, 1.28)	—	1.02 (0.86, 1.21)
${NO}_{2}$ , [ppb (min, max)]
Quartile
Q 1 (1.18, 5.64)	348/149	Ref	375/156	Ref
Q 2 (5.64, 8.14)	297/135	1.18 (0.85, 1.64)	333/165	1.29 (0.95, 1.75)
Q 3 (8.14, 11.38)	344/136	1.06 (0.73, 1.53)	362/152	1.11 (0.78, 1.58)
Q 4 (11.38, 41.32)	314/139	1.19 (0.80, 1.77)	327/151	1.24 (0.84, 1.82)
Per IQR (5.7 ppb)	—	1.16 (0.99, 1.37)	—	1.10 (0.94, 1.28)

Note: —, not applicable; CI, confidence interval; IQR, interquartile range; ${NO}_{2}$ , nitrogen dioxide; OR, odds ratio; $particulate matter begin subscript 2.5 end subscript$ , fine particulate matter (PM $less than or equal to 2.5 micrometers$ in aerodynamic diameter); ppb, parts per billion; Q, quartile; Ref, reference.

^{^a}

Limited to participants who had lived at the enrollment address for at least 10 y ( $lowercase italic n equals 1,862$ ).

^{^b}

Limited to participants who did not move since enrollment ( $lowercase italic n equals 2,021$ ).

^{^c}

Adjusted for baseline age, race and ethnicity, education, smoking status, body mass index, health status, census region, residential area type, household income, marital status, and self-reported sense of smell.