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Greenhouse Gases (GHGs)
Greenhouse gases (GHGs) are gases in the atmosphere that
trap energy from the sun. Naturally occurring GHGs
include water vapour, ozone, carbon dioxide (CO2),
methane (CH4), and
nitrous oxide (N2O).
While these are naturally occurring gases, there are serious
concerns regarding the enhanced effect on climate because of
increased levels of some of these gases in the atmosphere,
mainly due to human activities.
Criteria Air Contaminants (CACs)
Criteria air contaminants (CACs) are air pollutants,
including sulphur dioxide (SO2),
oxides of nitrogen (NOx),
carbon monoxide (CO), volatile organic compounds (VOC), and
particulate matter (PMT,
PM10, and PM2.5).
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