A PSI reading of 0-50 is considered good, 51-100 is moderate, 101-200 is unhealthy, 201-300 is very unhealthy and above 300 is hazardous. A smoke haze is an annual occurrence in Singapore and typically occurs in the May to October period. It is caused by winds bringing in tiny particles of ash from the raging forest fires in neighbouring Sumatra, Indonesia. These particles are called PM10 (10 refers to the size in microns of the particulate matters). Breathing in an excess of these particles can increase a person’s risk of developing viral and bacterial infections, as well as heart and lung diseases, cancer and stroke. Taken from Yahoo News...
Posted on: Thu, 20 Jun 2013 06:35:09 +0000
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