Air quality data for larger NSW centres are published by the NSW Department of Environment, Climate Change and Water at http://www.environment.nsw.gov.au/aqms/aqi.htm. In Sydney the measurements include ozone, nitrogen dioxide, carbon monoxide, sulfur dioxide, and particles (PM10 and PM2.5 - 'visibility'). However in regional areas, such as Tamworth, only particles (PM10) are measured.Armidale
Armidale isn't included in the NSW DECC monitoring network, but because of the problem from woodsmoke, the Armidale-Dumaresq Council measures fine particles (PM2.5) using a Dustrak monitor. Data are published weekly on the Council website at http://armidale.nsw.gov.au/ (under Environmental | Woodsmoke from the main menu).
(Current Armidale PM2.5 Measurement )
http://www.dec.wa.gov.au/content/view/6821/2470/ or follow the links under Pollution Prevention on the main menu.
http://epa.tas.gov.au/epa/real-time-air-quality-data-for-tasmania ( or follow links from main page http://epa.tas.gov.au/epa/air).
Australian sites as well as within Asia. Monthly summary data can be found at this webpage. Data for some coastal sites in NSW are available via an interactive map.