Slight haze as PSI climbs into moderate range
Published on Mar 4, 2014 11:45 AM
Singapore experienced slight haze on Tuesday morning, as the Pollutant Standards Index's (PSI) three-hour reading crept into the moderate range. It stood at 51 as of 11am.
Air quality had gradually worsened overnight from a reading of 33 at midnight on Tuesday morning.
The National Environment Agency (NEA) had said in an advisory on Sunday that although prevailing north-easterly winds would keep haze from Sumatra, Indonesia, away from Singapore for several days, "occasional slight haze" could occur. This was particularly so in the mornings, as a result of the accumulation of particulate matter under stable atmospheric conditions.
The Riau province of Sumatra has been shrouded in dense haze over recent days as farmers set fires to clear land during the dry spell. The NEA detected 70 hotspots in Sumatra on Sunday, and noted that smoke plumes were visible in Riau.
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