# Recognise combustion risks and respond safely

Lesson 2 of [Boiler buyer foundations](https://boilerpros.fyi/academy/boiler-buyer-foundations.md), 12 minutes.

Carbon monoxide, or CO, is a poisonous gas that people cannot see or smell. CDC explains that it can cause sudden illness and death. CPSC explains that incomplete burning of fuels can produce it. For a buyer of boiler services, the practical lesson is to arrange qualified maintenance and know how to…

The rest of this lesson is for learners enrolled in the course. [See how Boiler buyer foundations works](https://boilerpros.fyi/academy/boiler-buyer-foundations.md).

Also on the [web page](https://boilerpros.fyi/academy/boiler-buyer-foundations/combustion-safety-and-alarms).