Figure 1.

Participant selection flowchart. Aβ, β‐amyloid; APOE4, apolipoprotein E ε4; CO, carbon monoxide; ¹⁸F‐FBB, ¹⁸F‐florbetaben; NO₂, nitrogen dioxide; MCI, mild cognitive impairment; NP, neuropsychological; PET, positron emission tomography, PM, particulate matter; SO₂, sulfur dioxide. ^†Normalized hourly cumulative value = ${\sum }_{t_i=1}^{24\times 365\times 5\mathit{\text{hours}}}\frac{\mathit{\text{Pollutant}}\left(i,t_i\right)\times \Delta t}{\sum \Delta t.}$.