The unique sensors of Galaxy S4 brings some unique features related to your health. The sensors are used mostly on S Heath, but There are some apps which show some information about the environment by the aid of barometer, temperature and humidity sensors.
These apps mainly measure the ambient air temperature, air pressure, humidity and Illuminance
Here are the 2 best ones, which only work on Galaxy S4 devices
Download Ambient Temperature Galaxy S4 from Google Play