What type of hazardous material would lead individuals to seek shelter?

Airborne hazardous materials are substances that can be dispersed in the air and pose health risks to individuals through inhalation. When these materials are released into the environment, they can quickly contaminate the air, making it unsafe for people to breathe. This urgent situation necessitates individuals seeking immediate shelter or evacuating to a safer area to avoid exposure.

In contrast, solid and liquid hazardous materials may require containment and cleanup efforts but typically do not pose an immediate airborne risk that would lead to mass sheltering. Radioactive materials, while also dangerous, often require specific protective measures that may differ from seeking immediate shelter, such as using specialized equipment. Therefore, airborne hazmat is particularly compelling in the context of prompting individuals to find shelter quickly.