inspecting factories and other industrial or commercial premises (except shops), oil rigs, railways, mines, nuclear installations, building sites, hospitals, sports grounds, fairgrounds and agricultural siteschecking the safety and calculating risk factors of machines, building methods, or the use of chemicalstaking photos and measuring noise, temperature and vibration levelsinvestigating complaints and the causes of accidents, including fatal accidentswarning employers or managers about bad practices and initiating enforced changes