Some urban air pollution networks Europe
Know your air for health (This website provides citizens with information on national and local air pollution in Europe. It also offers useful links and references on how to find information about action aimed at improving air quality at the national level and in your local area. The text is particularly intended to meet the needs of those considered susceptible to air pollution.)
United Kingdom(NO2) 
City of London, England (Air Text – real time conventional monitors)
London Air Quality Network (Kings College-real time)
Mobile Environmental Sensing Systems Across Grid Environments (real time- street level maps based on small mobile monitors) 
Canada
CESI Interactive Mapping Application The Canadian Environmental Sustainability Indicators (CESI) initiative provides data and information to track Canada’s performance on key environmental sustainability issues of concern to Canadians: air quality and air pollutant emissions, water quality, greenhouse gas emissions, water levels and protected areas.
Hourly AQI (combined PM2.5 and O3) for Eastern Canada/US Milton, Halton Region, Ontario (real time AirPointer Monitor)
Ontario’s Air Quality Index Readings (real time)
City of Montreal, Quebec(real time)
City of Hamilton, ON (real time network) British Columbia Air Quality (real time)
Europe
United States 
AirNow Today’s AQI Forecast for USA 
USA- AIRNow (Air Quality Forecast)
USA-AIRNow Particulate Matter (real time)
CBS News Interactive Eye on Pollution
Air Quality Monitoring Sites GIS (North Carolina real time data)
Los Angeles Air Quality Index Forecast Map
Air Quality Maps of San Joaquin Valley, California (real time) 
Counties with Dangerous Air Quality
INDIA
(PALS ‘Pure Air Lovers Society’)
Thanks very much
- there’s a lot to be said about the link between road design and health impacts from the vehicles that use them
- if you have any specific suggestions or comments, they would be most welcome
PM 2.5 concerns here in Fairbanks, Alaska. Why does the USA AirNow site map not include Alaska? Last winter we had dozens of exceedences of the 35 microns/cubic meter of air and its not even on their map.
As a Canadian, do not know the answer to your question but agree Alaska isn’t shown on the Airnow map (as Hawaii is)
- when I did a search for Airnow and Alaska I found links to several sites that do show maps and values of PM in Alaska- for example at https://fortress.wa.gov/ecy/aaqm/Default.htm
- you might ask EPA directly or leave a comment on the airnow site
http://airnow.gov/index.cfm?action=airnow.local_state&stateid=2
The Fortress still does not include the Fairbanks PM 2.5 nonattainmt area. It does include several attainmt areas in Alaska however.
The AIRNow site doesn’t appear to have a submit comments email. But no matter, Fairbanks data isn’t exportable yet. Here we breathe, worst in the nation many winter days.
You may be interested in adding this link: http://co.fairbanks.ak.us/airquality/