Update README.md

README.md

@@ -9,6 +9,9 @@ Please have a look at our [OpenSense wiki](https://gitlab.ethz.ch/tec/public/ope
 
 ## Public Air Pollution Dataset
 
+### Ultrafine Particle Dataset
+One year (2012/04-2013/04, ~11Mio samples) of UFP data collected by the mobile sensor network can be found here: [https://zenodo.org/record/1415369#.W5os7C0zbmE](https://zenodo.org/record/1415369#.W5os7C0zbmE)
+
 ### Test datasets
 Two test datasets can be found here:
 * [Ozone (O3)](data/ozon_tram1_14102011_14012012.csv)