Introduction to EMS Operations and Hazardous Response Test No. 1 Questions taken from Chapter 25 of Emergency Medical Responder - First on Scene (9th Edition) Progress Indicator: Question 1 of 15 1.  Which NFPA standard should you become familiar with to help you at hazardous materials incidents? p. 577 Choices: NFPA 473 NFPA 671 NFPA 674 NFPA 472