Mine ventilation and atmospheric control require suitable temperature, humidity, and regular air measurements in belowground workplaces. Ventilation, temperature and humidity standards are prescribed for belowground mines to maintain suitable atmospheric conditions in workplaces by natural or artificial means. The employer must prevent insufficient air supply, stagnant or vitiated air, harmful draughts, excessive heat or cold, sudden temperature changes, and, where practicable, excessive humidity or dryness and objectionable odours. Adequate ventilation must be provided to remove smoke, fume, steam and dust and to dilute inflammable or noxious gases so that they become harmless.