Air quality in Malaysia: impacts, management issues and future challenges

Area of Science:

• Environmental Science
• Atmospheric Chemistry
• Air Quality Monitoring

Background:

• Long-term air pollutant trends in Malaysia from the 1970s to 1998.
• Atmospheric environment influenced by local and transboundary emissions, characterized by haze and non-haze periods.

Purpose of the Study:

• To analyze long-term trends of major air pollutants in Malaysia.
• To identify sources and characteristics of air pollution, including haze episodes.

Main Methods:

• Analysis of historical air quality data for nitrogen dioxide, carbon monoxide, ozone, sulfur dioxide, and total suspended particulate matter (PM10).
• Correlation of pollutant levels with emission sources (vehicular, industrial) and meteorological conditions.
• Examination of major haze episodes, including the severe 1997 event, and their transboundary nature.

Main Results:

• Vehicular emissions dominated urban air pollution, with diurnal peaks linked to traffic and meteorology.
• Total suspended particulate matter (PM10) frequently exceeded air quality guidelines and was the primary cause of haze.
• Six major haze episodes occurred since 1980, with the 1997 event being the most severe, largely attributed to biomass burning in Indonesia.

Conclusions:

• Overall air quality in Malaysia has deteriorated since 1970.
• Without effective countermeasures, emissions of key pollutants are projected to increase significantly by 2005.
• Transboundary haze, particularly from biomass burning, poses a major threat to regional air quality and incurs substantial economic costs.