Atmospheric aging analysis demonstrated that secondary aerosols were the most significant component during the haze events. Despite reductions in anthropogenic emissions, larger proportions of secondary aerosol formation enhanced aerosol aging and thereby caused episodic haze pollution during the lockdown period.
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secondary aerosol formation
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secondary aerosols
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As pollution intensified, the proportion of core-shell particles increased and the core-to-shell ratio decreased, consistent with a substantial contribution of secondary aerosols to haze formation.
Despite reductions in anthropogenic emissions, larger proportions of secondary aerosol formation enhanced aerosol aging and thereby caused episodic haze pollution during the lockdown period.
Reduced human activities corresponded with a lower percentage of anthropogenic-derived soot, organic particles, and metal-containing particles.
Sulfur-dominant, ultrafine, and mixed particles were the most abundant particle types during the pollution process.
Secondary aerosols were the most significant component during the haze events.