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Channel News Asia3-hour PSI in Singapore briefly crosses 100-markChannel News AsiaSINGAPORE: The three-hour Pollutant Standards Index (PSI) crossed the 100 mark for the first time on Thursday afternoon (Aug 20), as the National Environment Agency (NEA) said the slightly hazy conditions were due to smoke from fires in Indonesia.Hazy conditions may persist overnight due to Sumatra fires: NEAAsiaOneall 5 news articles »