When is lead air monitoring required every 12 months?

Short answer: when an employee's exposure to airborne lead is more than half the occupational exposure limit. From that point the Lead Regulations, 2001 require a measurement programme carried out by an approved lead inspection authority, or by a person it has verified, with representative measurements at least every 12 months. Above the limit itself, the exposure must also be brought under control.

The Lead Regulations, 2001 were published as Government Notice R. 236 in Government Gazette 23175 on 28 February 2002, came into operation that day and replaced the Lead Regulations of 1991. They apply to every employer and self-employed person at a workplace where lead is produced, processed, used, handled or stored in a form in which it can be inhaled, ingested or absorbed (regulation 2(1)). The Regulations for Hazardous Chemical Agents, 2021 do not apply where the Lead Regulations apply. Draft replacement regulations were published for comment on 1 March 2024 (Government Notice R. 4437). They would repeal the 2001 regulations 18 months after promulgation; until then, the 2001 regulations remain the law.

The limits that decide what you must do

• Occupational exposure limit (OEL): 0,15 mg of lead per cubic metre of air for lead other than tetra-ethyl lead, and 0,10 mg/m³ for tetra-ethyl lead (regulation 1).

• Monitoring trigger: exposure in excess of half the OEL, which is above 0,075 mg/m³ for lead other than tetra-ethyl lead (regulation 7(1)).

• Medical surveillance: an employee exposed to an airborne lead concentration above the OEL must be under the medical surveillance of an occupational medicine practitioner (regulation 8(1)).

• Respirator zone: an area where exposure would exceed the OEL without respiratory protective equipment must be zoned as a respirator zone, demarcated and signposted (regulation 9).

What regulation 7 requires

Where exposure exceeds half the OEL, the employer must ensure that the measurement programme is:

• Done by the right people: an approved lead inspection authority, or a person whose ability to do the measurements is verified by an approved lead inspection authority (regulation 7(1)(c)).

• Verified if done in-house: at intervals not exceeding 12 months, the approved lead inspection authority must examine your equipment, question your sampler, carry out the programme with them for one group and record the results (regulation 7(3)).

• Discussed first: the health and safety representative or committee must be informed beforehand and given a reasonable opportunity to comment (regulation 7(1)(b)).

• Representative: group sample sizes must follow the NIOSH Occupational Exposure Sampling Strategy Manual. If the most exposed employee is above the OEL, everyone else whose exposure could be above it must be identified and measured (regulation 7(2)(a)).

• Repeated: representative measurements must be carried out at least every 12 months (regulation 7(2)(c)).

• Recorded: assessment and air monitoring records must be kept for at least 40 years and made available to the health and safety representatives or committee (regulation 10).

When 12 months is not enough

The regulations set no shorter fixed interval, but other duties can bring the next measurement forward:

• The OEL is exceeded: regulation 7(2)(c) applies regulation 11 (control of exposure), and regulation 9(d) requires the reason to be identified and action taken, as soon as is reasonably practicable, by means other than respiratory equipment, so that airborne lead does not exceed the OEL. Re-measuring shows whether the controls worked.

• The assessment must be reviewed: regulation 6(5) requires an immediate review if there is reason to believe the previous assessment is no longer valid, control measures are no longer efficient, technological or scientific advances allow more efficient control, or there has been a significant change in work methods, the type of work or the equipment used to control exposure.

• The routine assessment falls due: regulation 6(1) requires the undertaking to be assessed at intervals not exceeding two years to determine whether anyone may be exposed to lead.

A new furnace, a switch from wet to dry cutting or a failed extraction fan are typical triggers. If a review shows that more employees may now be above half the OEL, bring them into the programme.

A quick self-check

• Find the date of your last lead air monitoring report. If it is nearly 12 months old, book the next survey.

• Check the date of your lead assessment. It must be repeated at intervals not exceeding two years.

• Compare each employee's latest result with 0,075 mg/m³ (half the OEL) and 0,15 mg/m³ (the OEL). Everyone above half the OEL belongs in the programme.

• If you sample in-house, confirm that an approved lead inspection authority verified your sampler and equipment within the last 12 months.

• Where results exceed the OEL, check the respirator zone signs, the medical surveillance list and the plan for engineering controls.

• Confirm that engineering controls, such as local exhaust ventilation, were examined and tested within the last 24 months (regulation 14(b)).

How Qualitas can help

Qualitas Occupational Consulting is a Department of Employment and Labour Approved Inspection Authority and a SANAS-accredited (ISO/IEC 17020) inspection body for asbestos, lead, noise and hazardous chemical agents. Our lead monitoring measures employees' personal exposure to airborne lead, compares it with the OEL and the half-OEL trigger, shows who belongs in the 12-monthly programme and where respirator zones are needed, and recommends practical controls, in a report written for management, SHEQ teams and auditors.

Air monitoring also tells your occupational health provider who must be under medical surveillance. See our articles on blood lead tests and on approved inspection authorities and competent persons.

Not sure what your site needs? Start with our free Compliance Gap Analysis, request a quote, or call or WhatsApp 082 649 6599.

This article summarises the Lead Regulations, 2001 (Government Notice R. 236, Government Gazette 23175, 28 February 2002) for general guidance. It is not legal advice; refer to the regulations for the full requirements.

Christo de Wet is a SAIOH-registered occupational hygienist with 15 years' experience and the founder of Qualitas Occupational Consulting.