Fancy turning your Raspberry Pi into an air quality detector with a GUI? Well, now you can with a new project. Utilising an MQ-135 air quality sensor, the project promises to deliver accurate readings, which can be interpreted with an onscreen GUI.
https://www.notebookcheck.net/Raspberry-Pi-New-project-brings-adjustable-air-quality-detector-to-the-popular-single-board-computer.459793.0.html