Malaysia
Similar to Hong Kong, the air quality in Malaysia is reported as the API or Air Pollution Index. Four of the index's pollutant components (i.e., carbon monoxide, ozone, nitrogen dioxide and sulfur dioxide) are reported in ppmv but PM10 particulate matter is reported in μg/m3.
This scale below shows the Health classifications used by the Malaysian government.
| API | Air Pollution Level |
|---|---|
| 0 - 50 | Good |
| 51 - 100 | Moderate |
| 101 - 200 | Unhealthy |
| 201 - 300 | Very unhealthy |
| 301+ | Hazardous |
If the API exceeds 500, a state of emergency is declared in the reporting area. Usually, this means that non-essential government services are suspended, and all ports in the affected area are closed. There may also be a prohibition on private sector commercial and industrial activities in the reporting area excluding the food sector.
The highest API value ever recorded was 839 in Kuching on 23 September 1997 during the 1997 Southeast Asian haze.
Read more about this topic: Air Pollution Index