All about Singapore Haze Updates & Relevant News

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1. What is Haze?

Haze is a result of accumulation of dust and smoke particles in relatively dry air. Singapore is more likely to be affected by haze in the months of May to October as a result of very dry weather conditions in the region intensifying the effects of the fires in Indonesia and the prevailing Southwest Monsoon winds blowing the smoke from the fires in Singapore’s direction.

2. What are the health effects of Haze?

Haze contains dust and smoke particles. It also contains air pollutants such as sulphur dioxide, nitrogen dioxide, ozone, carbon monoxide and particulate matter. Due to the small particulate size, the particles that make up haze can go deep into the lungs, and in some cases, enter the bloodstream.

The health effects can be classified into local and systemic effects.

Local effects can result in eye, nose, and throat irritation. People with history of sinus problems or sensitive nose are more likely to develop nasal congestion, sore throat and coughing. There may be increase incidents of skin irritations as well for those with eczema or other skin conditions.

Picture adapted from http://blissair.com/health-effects-of-haze.htm

Systemic effects are more serious. These can range from respiratory conditions such asthma attacks and bronchitis to worsening of heart diseases such as heart attacks or heart failure.

The following groups of people should minimise outdoor activities when the air quality is bad.

 Children as they are more vulnerable due to faster breathing rates and the fact that their lungs are still developing.

 Elderly as they are more prone to adverse health conditions because of past medical conditions.

· Patients with past medical problems such as

o Any respiratory conditions especially those with asthma, chronic obstructive lung diseases.

o Any heart diseases especially those with coronary artery disease, congestive heart failure.

o Any history of ear, nose and throat problems such as allergic nasal conditions or problem with sinusitis.

o Chronic diseases such as diabetes as patients with diabetes are more prone to cardiac conditions.

3. How is the severity of Haze measured?

This is measured by the PSI. PSI stands for 'Pollutant Standards Index'. It is an index developed by the United States Environmental Protection Agency (USEPA) and is determined by the level of air pollutants such as sulphur dioxide, nitrogen dioxide, ozone, carbon monoxide and particulate matter called PM10 (particulate matter of 10 microns or smaller in size).

The PSI value gives an indication of the air quality as shown: PSI Value	PSI Descriptor
0 to 50	Good
51 - 100	Moderate
101 - 200	Unhealthy
201 - 300	Very unhealthy
Above 300	Hazardous

4. What are the health advisories pegged to PSI and PM2.5?

The following is taken from National Environment Agency of Singapore PSI Value	Health Advisory
0 to 50 (Good)	None for the general population
51 to 100 (Moderate)	None for the general population
101 to 200 (Unhealthy)	Persons with existing heart or respiratory ailments should reduce physical exertion and outdoor activity. The general population should reduce vigorous outdoor activity.
201 to 300 (Very unhealthy)	Elderly and persons with existing heart or lung disease should stay indoors and reduce physical exertion and outdoor activity. The general population should avoid vigorous outdoor activity.
301 to 400 (Hazardous)	Children, elderly and persons with existing diseases should stay indoors and avoid outdoor activity. The general population should avoid unnecessary outdoor activity.
> 400 (Hazardous)	Children, elderly and persons with existing diseases should stay indoors, keeping the windows and doors closed and avoiding physical exertion as far as possible Outdoor activity should be avoided. The general population should keep physical exertion and outdoor activity to as low a level as possible.

Health advisories pegged to PM2.5 24-hr PM2.5concentration (μg/m3)	Health Advisory
0 to 15	None
>15 to 40	None for the general population. Unusually sensitive people should consider reducing prolonged or heavy exertion.
> 40 to 65	Following groups should reduce prolonged or heavy outdoor exertion:  People with heart or lung disease  Children and older adults Everyone else should limit prolonged or heavy exertion.
> 65 to 150	Following groups should avoid all physical activity outdoors:  People with heart or lung disease  Children and older adults Everyone else should avoid prolonged or heavy exertion.

5. When do we need to wear a mask?

The general recommendation is for healthy people to minimise outdoor activities when the PSI is greater than 100 or when the PM2.5 is greater than 40. For those who are of higher risk, they should minimise outdoor activities when the PSI is greater than 80 or when the PM2.5 is greater than 15.

When the 24-h PSI level exceeds 150 in the 'Unhealthy' range or when PM2.5 is greater than 40, people with existing heart or respiratory ailments or those who are more susceptible to smoke haze are advised to wear a respiratory mask such as N95 masks (designed to keep out fine particulate matter) when they go outdoors. People with respiratory diseases should consult their doctors on the use of respirator masks if they intend to use them. N95 masks can be acquired through Raffles Medical Group.

Surgical masks and paper masks do not provide adequate protection from the haze particles.

 

Regards, Adam Chua Co-Founder of Vacant Seize .COM