What type of alarm is triggered by environmental changes such as smoke or gas?

The term "Environmental alarm" specifically refers to alarms that are activated by changes in the environment, such as the presence of smoke, gas, or other hazardous conditions. These alarms are designed to detect environmental threats and alert occupants to potential dangers, ensuring timely response to emergencies such as fires or gas leaks.

While a fire alarm could be considered a type of environmental alarm, the broader category encompasses not just fires (detected by smoke), but also other environmental factors, such as gas levels that may indicate a leak or chemical spill. Access alarms, on the other hand, are concerned with unauthorized entry, and intrusion alarms focus on the detection of burglaries or unauthorized intrusion into a property. Thus, "Environmental alarm" captures the essence of responding to various hazardous environmental conditions effectively.