Which gas is NOT included in the 4H MEDIC ANNA acronym?

The 4H MEDIC ANNA acronym is a mnemonic used in the context of hazardous materials awareness to help responders quickly identify key hazardous gases and their associated risks. Hydrogen fluoride, acetylene, and neon are indeed included in this acronym, as they represent significant hazardous materials that responders may encounter.

Chlorine, while a hazardous gas with well-known risks, is not part of the 4H MEDIC ANNA acronym. The omission underscores the focused nature of the mnemonic, which is designed to help first responders prioritize their awareness and response strategies regarding specific gases of primary concern in hazardous material situations. By recognizing which substances are included, responders can better prepare for the potential hazards they may face in emergency scenarios.