Are "Clean" Days Really Clean? Single Particle Elemental Signatures of PM<sub>2.5</sub> Unveil Their Pulmonary Health Risks.

Notably, the proportions of Al- and Si-rich FPs within all mmFPs exhibited an increasing trend with rising PM 2.5 levels, whereas the proportion of Fe-rich FPs displayed a decreasing trend.

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Regarding the distribution of metal mass fractions in individual mmFPs across varying PM 2.5 levels, the number contributions of Fe-rich FPs to Fe-mmFPs showed a decreasing trend from WHO and GB days to haze and dust days, and this trend was also shown for Si-rich FPs in the winter.

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