I have been using air purifier for years in Beijing, China. So far so good except the only problem troubles me, is that effective? is my PM2.5 or PM10 reduced? the answer is probably obvious, but how effectively is it? Nobody knows.
At the morment, Dylos is the only manufacturer that provides consumer level product with accurate air quality index, so, not many choice. I got a Dylos air quality counter from Amazon, there are many products, if you want to export the index data from the black box into your desktop for later process , you'll need at least a DC 1100 pro with PC interface or higher version. Strongly not recommend buying from Taobao or the similar online stores, as far as I saw, None of them can provide the correct version, most of them exaggerate for a higher sale.
Now, half done. You need to Raspberry Pi, at the time of writing, Raspberry Pi 2 is coming to the market. I got a complete starter kit with a Pi 2 Model B, Clear Case, power supply, WiFi Dongle and a 8GB Micro SD.
In order to make the Raspberry Pi up, it's better to find a screen monitoring, or it will take huge pain to you.
After turning Dylos and Raspberry Pi on, the left process is quite simple. You need to connect the Dylos and Raspberry Pi with a serial to USB interface, the serial to USB cable is uncommon these days, if you are a network engineer, you should be quite familir with the cable, else, you can get one from online or somewhere else.
Now, write a tiny program to read the data from Dylos. You can make use of Python's pyserial module to read the data with a few lines. Here is mine. Besides that, you can use other language to implement, such as PHP. The interval depends on your Dylos collecting data interval, the minimum is 60s, ususally 3600s is enough.
Once got the data, you can feed them into different metric systems like Munin, or you can feed them into highcharts to get a more pretty look.