Water is always valuable for everybody. Here is the awesome project, WiRoTip for people or city that has problem with potable water supply monitoring. It shows how small ideas and a few skills can make a lot of possibilities today.
Recently, one of serious air pollution issue is fine dust. And it charges a lot of portion. We need to monitor an air quality and handle this! Before we figure out it, looking up how to monitor an air quality.
Have you used Wi-Fi module before? Arduino and Wi-Fi module 'WizFi310' are used in this project to send a HTTP POST Request to Ubidot. Like this example, you can request a HTTP REST API to other server using a WizFi310.
First of all, This example give us information that is how much it will cost to make it. It says total cost for this project is about $ 150. Also there are Components info that all you need and Youtube/Github link. If you want to make an IoT Smart home, It will be nice :)