17 May '11, 9am

The PSI reading as of 4pm on Tuesday was 54 which is within the 'moderate' range

Periods of light wind conditions are common during the inter-monsoon months. During this time, particulate matter in the air may take longer to disperse, resulting in slightly hazy skies over Singapore even though the ambient air quality is still within the good range (Pollutant Standards Index or PSI below or equal to 50). The occurrence of rain will help ease the slightly hazy conditions. On average Singapore experiences 15 days of rain in May.

Full article: http://www.straitstimes.com/BreakingNews/Singapore/Story/...

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