Box for a sensor program being run in Singapore by Roland Turner, Yahi - yet another hase index. The project is a community air quality measurement initiative to test haze across Singapore. http://rolandturner.com/yahi/mapping-pilot It uses a small sensing station that consists of a Shinyei PPD42NS/NJ dust particle counter paired to a Spark Core, (https://www.spark.io/). The set consist of 4 files: Assembly The sensors kit can be purchased from 12 Geeks (http://12geeks.com/shop/yahi-sensing-station-kit-mapping-pilot-edition-assembled-and-tested.html)