Singapore's 3-hour PSI crosses 100 into unhealthy range

A slightly hazy sky can be seen in Ulu pandan on March 20, 2015.

Update: Haze in Singapore remains at unhealthy range. The 3-hour PSI reading at 7pm was at 105.

SINGAPORE - Air quality in Singapore creeped into the unhealthy range on Friday. The Pollutants Standards Index (PSI) was going up throughout the day and peaked at 102 at 4pm.

The National Environment Agency (NEA) said that the 24-hour PSI as at 3pm stands at 66-74. The 3-hour PSI index had been climbing steadily since 8am, when it hit 65.

"The slight haziness could be due to the accumulation of particulate matter in the air under light wind conditions,"  said NEA said in a statement.

"The situation is expected to improve with the strengthening of the winds later in the day," it added.

Members of the public are advised to avoid prolonged or strenuous outdoor activities when air quality is in the unhealthy range.

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