This is an interesting and easy to do project.
Suppose we want to monitor air quality as well as concentration of gases in air of different cities or locations in real time.
We can achieve this simply with an #arduino, ESP8266 wifi module, some gas sensors and PHP
This is very interesting. I also considered to built these sensors for detecting high concentration of carbon monoxide or propan-butan in sake of increase safety. Only thing what I'm not sure about is calibration of these sensors. Simple value from ADC isn't much useful. But I'm definitely interested in :)
I'm currently working on this project. i'm just looking for a way to transfer sensor data directly to my Web server.
Your suggestion will be highly appreciated.