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(a) Mass concentration of ions (in PM2.5-1.0, PM1.0–0.5 and PM0.5-0.25) in general indoor air during API OFF and ON scenario (b) Mass concentration of ions (in PM2.5-1.0, PM1.0–0.5 and PM0.5-0.25) in general indoor air during APII OFF and ON scenario.
