Which of the following refers to a deliberate release of a toxic gas, liquid or solid that can poison people and the environment?

The term that refers to a deliberate release of a toxic gas, liquid, or solid, which poses a threat to human health and the environment, is indeed a chemical attack. In the context of hazmat situations, a chemical attack specifically involves the use of hazardous substances that can cause harm when intentionally dispersed. This can include a variety of toxic agents that affect individuals through inhalation, contact, or ingestion, with the potential for significant, widespread impact.

Chemical attacks are particularly concerning due to their potential for mass casualties and long-term environmental effects. Such attacks may utilize nerve agents, choking agents, or blistering agents that can incapacitate or kill individuals. Understanding this definition is crucial for those trained in hazmat operations, as it helps responders to recognize the nature of the threat and respond appropriately to mitigate harm and manage the aftermath.

The other options—biological, inorganic, and industrial attacks—reflect different kinds of risks and attacks. Biological attacks involve living organisms or their toxins, inorganic attacks pertain primarily to non-carbon-based substances, and industrial attacks could refer to accidental releases in an industrial setting rather than a deliberate act with a specific intent to harm.