What is a characteristic of Class 3 locations regarding material presence?

In Class 3 locations, the defining characteristic is the presence of easily ignitable fibers or flyings. This classification is specifically concerned with environments where there are combustible materials that can easily ignite when exposed to a spark or an open flame.

These locations typically involve situations like textile manufacturing, woodworking shops, or areas where there are cotton, paper, or plastic materials that could produce a cloud of combustible fibers. It's essential for safety measures and equipment selection to recognize this hazard, as it influences decisions regarding the type of electrical equipment and protective measures required to prevent ignition.

The other options presented involve different hazards that relate more directly to other classes of locations. For example, explosive gases pertain to Class 1 locations where flammable gases, vapors, or liquids are present. High temperatures are not a defining characteristic for any specific hazardous location class but can contribute to ignition risk in various environments. The presence of toxic substances relates to health safety rather than ignition hazards and is typically addressed separately in regulatory contexts.