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Hourly PM2.5 readings normal in four regions; PSI forecast to remain unhealthy on Thursday

Hourly PM2.5 readings normal in four regions; PSI forecast to remain unhealthy on Thursday
Photo: CNA — Singapore · view original

Air quality improved on Wednesday (Oct 21) and by 11pm, only the west's 1-hour PM2.5 reading was in the elevated range.

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