The "Laser Egg" from a chinese company does exactly this job. Measuring the airquality with a handy device and displaying it either on its own nasty bright screen or on any mobile device via an App.
It is a matter of fact, that within the first days a new owner of a LaserEgg measures the airquality almost anywhere. At the Supermarket, the favourite restaurant, office or Kindergarden, in the bathroom, livingroom or balcony, in the car, under the bed, on the roof, under the shower, while smoking, on top of the airpurifier, in the fridge or dishwasher and last but not least within the palmtrees.
Video: Fun with LaserEgg