Haze creeps back: Seremban and Johor’s Larkin log highest API readings at 169

An API reading of 169 means the air is classified as unhealthy under Malaysia’s national ambient air quality guidelines. The index helps turn pollution measurements into a clear public-health warning. It matters because people may breathe polluted air during ordinary outdoor activities, especially when haze persists.

The article records 169 at Seremban in Negeri Sembilan and Larkin in Johor, the highest readings nationwide at 10.00am. Both locations were among 21 stations in the unhealthy bracket. The reading does not mean conditions were very unhealthy or hazardous, because no station reached either of those categories.

Health authorities particularly caution young children, senior citizens, and people with cardiovascular or respiratory illnesses. They advise these groups to avoid prolonged physical exertion outdoors. Anyone going outside should consider wearing a protective face mask, especially while unhealthy readings continue.

The unhealthy air was widespread but not nationwide. At 10.00am, 21 of Malaysia’s 68 monitoring stations recorded API readings from 101 to 200. Another 41 stations reported moderate air quality, while six stations remained in the good category. No station reached very unhealthy or hazardous levels.

The highest readings were concentrated in southern states. Seremban in Negeri Sembilan and Larkin in Johor tied at 169. Nilai followed at 167, while Bandaraya Melaka recorded 164. Johor had seven unhealthy stations, including Batu Pahat at 163 and Pasir Gudang and Tangkak at 162.

Other affected areas included all three stations in Melaka, all three in Negeri Sembilan, several Klang Valley locations, and three stations in Sarawak. Klang recorded 113, the lowest reading among the 21 unhealthy stations, showing that pollution intensity varied considerably.

The people most at risk are young children, senior citizens, and individuals with cardiovascular or respiratory ailments. Their health may be more vulnerable during periods of unhealthy air. The article gives this advice because 21 monitoring stations recorded API readings between 101 and 200, the national unhealthy range.

Health authorities advise high-risk groups to avoid prolonged physical exertion outdoors. Exercise and other strenuous activity can increase the amount of air a person breathes. The article also advises wearing protective face masks when venturing outside. These steps reduce exposure while unhealthy conditions remain.

The advice is especially relevant in places such as Seremban and Larkin, where the API reached 169. However, the article does not say that everyone must stay indoors or that illness will definitely occur. It presents precautions for high-risk groups while the haze affects several states.

Southern Malaysia was more affected in this report because it recorded the highest API readings and the largest concentration of unhealthy stations. Johor alone had seven stations in the unhealthy bracket. Melaka and Negeri Sembilan also placed all their listed stations in that category. These figures show a clear regional concentration, but they do not explain its precise cause.

For Sarawak, the article directly links the unhealthy readings to transboundary smoke. IPD Serian recorded 154, followed by Sri Aman at 152 and Kapit at 151. The source gives no equivalent explanation for why southern Malaysia recorded higher readings than other regions.

In general, haze can vary by location when pollution is transported by air movement or accumulates under suitable weather conditions. This is established atmospheric knowledge, not a specific finding in the article. The report provides a snapshot at 10.00am, so patterns could change as conditions develop.

The Department of Environment provides the official air-quality picture during the haze event. Its environmental monitoring dashboard reported readings at 10.00am and showed how many stations were good, moderate, or unhealthy. This matters because consistent measurements help identify where pollution is most serious.

The network contained 68 monitoring stations. Twenty-one recorded unhealthy readings, 41 recorded moderate air quality, and six recorded good air quality. All stations remained fully operational online. The data also identified the worst readings, including 169 at Seremban and Larkin.

These stations allow conditions to be compared across states and cities. The DOE’s information supports public warnings and health guidance, such as reducing prolonged outdoor exertion. It also shows that the haze was uneven, with Johor, Melaka, Negeri Sembilan, Klang Valley locations, and parts of Sarawak more affected than many other monitored areas.

Weather can change where haze goes and how long it remains. Wind moves smoke and tiny particles through the atmosphere, sometimes carrying pollution across national or state borders. Rain can wash some particles from the air, while changing weather patterns can disperse or concentrate pollution. These are established atmospheric processes.

The article gives one direct example: transboundary smoke pushed three monitoring stations in Sarawak into the unhealthy range. IPD Serian recorded 154, Sri Aman recorded 152, and Kapit recorded 151. This demonstrates that pollution can affect places beyond its original source.

The report does not state the wind direction, rainfall, or weather conditions during the 10.00am measurement. Therefore, it cannot show whether weather had spread or cleared the haze at that moment. Continued monitoring would reveal whether API readings later rose, fell, or remained unhealthy.

Haze is air containing enough smoke, dust, and other tiny pollutants to reduce visibility and harm air quality. Fine particles can remain suspended in the atmosphere and enter the respiratory system when people breathe. The article measures this pollution using the API, with readings from 101 to 200 classified as unhealthy.

Particles from fires, vehicles, and industrial activity can add pollution to the air. Very small particles may travel deep into the lungs and make breathing more difficult, particularly for people with respiratory or cardiovascular conditions. The source article does not identify which of these sources caused the reported haze, so these examples provide general context rather than a specific attribution.

The monitored conditions were serious but had not reached the very unhealthy or hazardous categories. Twenty-one stations were unhealthy, including Seremban and Larkin at 169. Authorities advised vulnerable people to avoid prolonged outdoor exertion and wear protective masks outside.