MOH says mask up, avoid outdoor activity as haze blankets Malaysia with unhealthy air

An API reading above 100 indicates unhealthy air. At this level, pollutants can affect health, so people should limit exposure to haze. The Ministry of Health particularly urges caution when outdoor activities are planned.

For example, the article reports that 35 monitoring stations recorded API readings from 101 to 200. The ministry advises people to avoid outdoor activities when readings exceed 100. If going outside is necessary, wearing an appropriate mask can reduce exposure to polluted air.

This warning matters because air quality was unhealthy across nine states and two Federal Territories. No areas reached the Very Unhealthy or Hazardous categories at the reported time. MOH will continue monitoring conditions and urges the public to remain vigilant and prioritise family health.

The unhealthy air was widespread rather than limited to one location. According to MOH, 35 air quality monitoring stations recorded API readings between 101 and 200, the unhealthy range. These readings involved nine states and two Federal Territories.

Johor recorded the highest number of affected areas, with eight. Selangor followed with six. Perak and Pahang each had four, while Negeri Sembilan and Melaka each had three. Kuala Lumpur and Sarawak recorded two areas each.

Putrajaya, Terengganu, and Sabah each recorded one affected area. However, no areas recorded Very Unhealthy or Hazardous readings at 2pm yesterday. The figures show that haze conditions differed across the country, so people should check local readings before planning outdoor activities.

PM2.5 refers to fine airborne particles about 2.5 microns or smaller in diameter. A micron is one-millionth of a metre. Because these particles are extremely small, they can travel with inhaled air into the respiratory system. The article identifies this ability as a health concern during haze.

For example, MOH recommends N95 masks because they can filter fine particles sized 2.5 microns. This gives people added protection when outdoor activity cannot be avoided. A three-ply mask may provide only limited additional protection if an N95 mask is unavailable.

PM2.5 is therefore important even when pollution is not visible as thick smoke. During the reported haze, MOH urged people to reduce exposure and monitor local API readings. Avoiding outdoor activity remains the strongest practical step when air quality becomes unhealthy.

The article states that PM2.5 can enter the respiratory system and harm health, but it does not provide a detailed list of illnesses. Established health guidance links haze exposure with eye and throat irritation, coughing, wheezing, shortness of breath, and worsening asthma. Fine pollution can also aggravate existing heart or lung disease.

Children and older people may be more vulnerable because their bodies can respond more strongly to polluted air. People with asthma, chronic lung disease, or heart conditions may notice symptoms sooner. For them, reducing exposure is especially important during unhealthy API readings.

MOH therefore urges the public to avoid outdoor activities when API exceeds 100. If going outside is necessary, an N95 mask can reduce exposure to fine particles. Anyone developing serious breathing or chest symptoms should seek medical care; this specific advice is general health guidance, not stated in the article.

Avoiding outdoor activity is more effective because it removes the main opportunity for exposure. A mask provides partial protection, but it cannot make polluted outdoor air harmless. MOH therefore identifies staying indoors and avoiding outdoor activities as the best way to minimise haze-related health effects when API readings exceed 100.

If someone must go outside, an N95 mask can filter fine particles sized 2.5 microns, including PM2.5. These particles can enter the respiratory system. If an N95 is unavailable, MOH says a three-ply mask may offer limited additional protection.

The advice reflects the current situation, not a complete elimination of risk. API readings were unhealthy at 35 stations, but no locations reached Very Unhealthy or Hazardous levels. People should check local conditions, limit time outdoors, and use suitable masks when necessary.

Haze and API readings vary because polluted air is not evenly distributed. The article states that pollution levels fluctuated according to location and current conditions. It does not identify the exact cause of each change. In general, wind, rain, temperature, and atmospheric movement can change how pollution concentrates or disperses.

For example, Johor recorded eight affected areas, while Putrajaya, Terengganu, and Sabah each recorded one. This uneven pattern shows that nearby or distant places can experience different air quality at the same time. Weather and local pollution movement can contribute to those differences.

People should therefore use local API readings rather than assume one national condition applies everywhere. MOH is continuing to monitor the haze and its health impact. Conditions may shift, so residents should remain vigilant and reduce exposure when readings become unhealthy.

Haze is polluted air containing suspended fine particles and gases that reduce air quality and visibility. It forms when emissions build up faster than the atmosphere can disperse them. The article confirms that haze affected several areas but does not explain its formation or name specific sources.

Common sources include open burning, forest or peat fires, vehicle exhaust, factories, and power generation. Wind can carry the pollution across regions. Still air, dry weather, and atmospheric layering can trap it near the ground, while stronger winds or rain may disperse or remove some particles. These mechanisms are established science, not details given in the article.

The practical consequence is changing exposure. During the reported episode, API readings differed by location, with 35 stations in the unhealthy range. Residents should check local readings, avoid unnecessary outdoor activity, and follow MOH advice.