I'm building a cheap, small, arduino based, wireless, internet enabled and battery powered air quality data logger.
It currently shows data collected from in my house (in Edinburgh, UK).
The last frame below is a copy of the data being stored on an SD card on the device which allows for data collection when a wireless connection isn't available.
Click here for more detailed build information
Small particles= no. of particles >2.5 micron(um) per 0.1 cubic feet detected in 30 seconds (pollen, mold, dust mites,heavier dust).