This site is an initiative by the Department of Environmental Sciences of FC College, Lahore Pakistan. We are using commercial air quality instrumentation from Environmental Devices Corporation (USA). This system is now supplemented with three other simple units, consisting of Arduino DUE microprocessor, a Plantower PM2.5 sensor, an AHT20 T/RH sensor, connected to wifi, and the data uploaded to the ThingSpeak platform, from where the graphs get downloaded to this website. 
The LIVE readings on the website are updated every 15 minutes while the graphs every minute.
 
Location of the EDC is at the Red Button on the map.