In general, Singapore has a high capability of managing its AQ
and, as such, its AQ is among the best in the region. Its form
of government made it easy to integrate the AQM agenda into
other urban sector and national economic concerns. Th eir
stringent controls on emissions and regulatory measures to
address the diff erent sources of pollution have been eff ective
in maintaining AQ at an acceptable level, with PSI readings
in the good range for most of the year. Singapore’s geography
and topography was conducive for air pollutant dispersion
but it likewise made it susceptible to trans-boundary haze as
» Part Six
in 1994 and 1997. Except for PM, Singapore does not have a
problem keeping their pollutant levels compliant with current
US EPA and WHO standards that they use in lieu of their set
of standards. With the onset of the 2005 global update to the
WHO standards and the current trends of their PM emissions,
the possibility of further noncompliance with both PM10 and
PM2.5 standards increases. However, new measures such as the
clean air component of the Singapore Green Plan 2012 that
addresses local and regional air pollution may help keep PM
and other pollutant levels at bay.