    ‘Sentence .1: approaches ‘far setting different  requirements, for: saurces- that pose’ different|  fevels of hazard: (tiering); worst-case releases|  and other hazard assessment issues; accident]  information reporting;, public. participation,  inherently »-. ‘safer... approaches; .- andl  implementation : and igtegration . of ' section]  1.12(r) with, staté progrims, "particularly state|  air permitting programs.    Sentence. 2: Diffesent | réquirements”,./are  required for different levels of hazard.