What are the types of gases found in the home like boiler?

In a home with a boiler, the primary gases that may be present include carbon monoxide, produced during incomplete combustion of fuels, and natural gas or propane, which are commonly used as fuel sources. Additionally, nitrogen dioxide can be emitted from gas appliances, and water vapor is a byproduct of combustion. Proper ventilation and regular maintenance are essential to minimize risks associated with these gases.