# The Control of Substances Hazardous to Health Regulations 1994, Schedule 4: SPECIFIC SUBSTANCES AND PROCESSES FOR WHICH MONITORING IS REQUIRED


Column 1
Column 2
Substance or process
Minimum frequency
Vinyl chloride monomer.
Continuous or in accordance with a procedure approved by the Health and Safety Commission.
Vapour or spray given off from vessels at which an electrolytic chromium process is carried on, except trivalent chromium.
Every 14 days.

---
Source: https://www.legislation.gov.uk/uksi/1994/3246/schedule/4 (the official version)
Page: https://openlegislation.uk/control-of-substances-hazardous-to-health-regulations-1994/schedule-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.