Very easy to use (with Tasmota), fast response (seconds) and very sensitive. Spray some sanitizer/deodorant a few rooms down or light up some toast and in about 30 seconds it's in the "red zone". Open the window and the reading will return to a safe value just as quickly. I used Wemos D1 Mini Lite and this sensor; That's it, just two parts and a USB power supply, cable and case. Added readings to another project with a display and also notifies our phones when air quality is above a threshold.
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