Which of the following describes Class 1 locations?

Class 1 locations are defined by the potential presence of flammable gases or vapors in the environment, which can create conditions conducive to combustion. These settings are typically areas where flammable gases, vapors, or liquids may be present in sufficient quantities to ignite if exposed to an ignition source.

The classification is crucial for determining the appropriate safety measures and equipment needed in those areas, including explosion-proof or intrinsically safe electrical devices and proper ventilation to mitigate risks. Understanding that Class 1 locations focus specifically on flammable gases clarifies why this answer is accurate.

Combustible materials and flammable liquids may be relevant in different classifications or contexts but do not accurately describe the unique characteristics of Class 1 environments, which are specifically focused on gases. In contrast to other options, noting that no hazardous materials are present directly contradicts the very definition of Class 1 locations, which are designed with the awareness of potential hazards that must be managed.