Which of the following is NOT one of OSHA's Focus Four injuries?

The Focus Four is a critical concept within OSHA's outreach programs aimed at reducing the most common types of injuries and fatalities in the construction industry. The three main categories of injuries that make up the Focus Four are falls, being struck by objects, and being caught-in or between objects. These categories represent significant hazards present on construction sites that lead to serious injuries and even fatalities.

Respiratory hazards, while important in the context of safety and health, particularly regarding inhalation of harmful substances, are not classified as part of the Focus Four injuries. Instead, respiratory protection falls under a different category of OSHA standards focused on general industry health regulations rather than specific injury prevention guidelines in construction. The Focus Four targets incidents that are most frequently reported in occupational injury statistics, emphasizing the most immediate and common safety concerns seen on job sites.