Here are some useful links to official Australian and International website relate to Air Quality and Emission Monitoring:
Environment Protection Authorities in Australia:
NSW Environment Protection Agency http://www.epa.nsw.gov.au/
VIC Environment Protection Agency http://www.epa.vic.gov.au/
WA Department of Environment Planning http://www.der.wa.gov.au/
QLD Department of Environment http://www.ehp.qld.gov.au/
SA Environment Protection Authority http://www.epa.sa.gov.au/
ACT Health - Air Quality Monitoring http://health.act.gov.au
NT Environment Protection Authority http://www.ntepa.nt.gov.au/
TAS Environment Protection Authority http://epa.tas.gov.au/
International resources:
US Environmental Protection Agency http://epa.gov/
US-EPA List of designated reference and equivalent methods, June 2015 PDF file
WHO Air Quality Guidelines http://www.who.int/
Wikipedia, basics of gas detection http://www.wikipedia.org/
Australian Institutes and Organizations:
CASANZ, Clean Air Society of Australia and New Zealand http://www.casanz.org.au
CASANZ measurement special interest group Measurement SIG
IICA, Institute of Instrumentation, Control and Automation https://www.iica.org.au/
NABERS, National Australian Build Environment Rating System https://www.nabers.gov.au/
NATA National Association of Testing Authorities http://www.nata.com.au/
Australian Bureau of Meteorology http://www.bom.gov.au/
Home Air Check Australia http://homeaircheck.com.au/