Abstract

We need to measure and share air pollution levels in our milieus to take protective action for our family’s health, if necessary, according to official recommendations such as Air Quality Index by FDA, and are able to analyze the big data shared by numerous people to design a smart city in the near future.

Smartphone has a great potential for such global pollution mapping since it provides multi sensor-platform for a lot of normal citizens; total smartphone subscriptions will reach 1.9 billion at the end of 2015 and are expected to grow to 2.6 billion, which is equivalent to one-third of world population, in 2018 (eMarketer, 2014).

I show three case studies of smartphone-based sensing in progress; (1) inexpensive but accurate dosimeter using PIN-photodiode sensor against Fukushima disaster, (2) mobile PM detector based on light scattering method, and (3) CO2 ppm monitoring in a house, at workplace or in a car.