foundation level courses bohs assessment MORE W501 W501 - Measurement of Hazardous Substances MORE W502 W502 - Thermal Environment MORE W503 W503 - Noise Measurements and Its Effects MORE W504 W504 – Asbestos and Other Fibres MORE W505 W505 – Control of Hazardous Substances MORE W506 W506 – Ergonomics Essentials MORE W507 W507 – Health Effects of Hazardous Substances