California is considering a significant change in the lead standard.  Please review all these documents.  If you can add other items please contact Dan Napier, CIH at 800-644-1924 X 103 or email him at, but a phone call is advised

Update on Linear No-Threshold (LNT) Research-Chapter 2 by Prof. Edward Calabrese, PhD

This is a very technical objection to the toxicologists discussion of possible impacts of low level exposure.

The Linear Non-Threshold (LNT) dose-response model is a commonly used model in radiation protection that predicts the health risks associated with low doses of ionizing radiation. The LNT model assumes that there is no safe threshold dose for radiation exposure and that even very low doses of radiation can increase the risk of cancer and other radiation-related health effects.

The LNT model is based on the idea that radiation-induced DNA damage is cumulative and that any additional damage increases the risk of cancer. The model assumes that the risk of cancer is directly proportional to the amount of radiation received, regardless of the dose level. In other words, the risk of cancer increases linearly with increasing radiation dose, without any threshold dose below which there is no risk.

The LNT model has been used as the basis for setting radiation exposure limits and guidelines for occupational and public radiation protection. However, it is also a topic of ongoing debate and controversy in the scientific community, with some researchers suggesting that the model may overestimate the risks of low-dose radiation exposure.

Critics of the LNT model argue that it is not based on direct evidence and that the risks of low-dose radiation exposure may be overestimated. Some studies have suggested that low doses of radiation may even have a protective effect against cancer, a phenomenon known as radiation hormesis. Nevertheless, the LNT model remains the default model for radiation protection and is widely used by regulatory agencies and researchers in the field.

In short the data is not conclusive and we should not be spending as much on the possible benefits of suspect data.

DTSC has gone on with the very low lead levels in spite of some very concise and clear criticism of the method that they have used to define lead content. 

The CIHC has commented on the new standard, however they left out the fact that they did nothing to keep the CIH as a competent professional..See Howard Spielman's letter

Greetings Everyone -

During the February 15, 2024 Cal/OSHA Standards Board Meeting, the Standards Board voted to approve the Proposed Amendments to the Cal/OSHA Lead Standards (8 CCR §1532.1 for Construction Safety and §5198 for General Industry) and related Permissible Exposure Limit in the Airborne Contaminants Standard (8 CCR §5155).
The newly approved Proposed Changes are intended to further protect workers from lead exposure, targeting requirements that are anticipated to result in lower blood lead levels for workers and reduce the number of workers who are exposed to elevated levels of lead in the workplace.
Some of the key changes include:
• Reduction of the lead Permissible Exposure Limit from 50 ug/m3 to 10 ug/m3 (exception for abrasive blasting at 25 ug/m3)
• Reduction of the lead Action Level from 30 ug/m3 to 2 ug/m3
• Implementation of trigger task Levels (Levels 1-3), which presume exposure over the PEL until an exposure assessment is performed
• Required shower facilities (previously only handwashing) based on certain criteria
• Expanded requirements for blood lead testing for employees who work with lead and changes to the frequency of monitoring based on exposure/air monitoring results
• Medical surveillance for all employees who perform trigger tasks in addition to confirmed lead-exposed employees
• Expanded medical removal requirements and return to work criteria based on blood lead testing results

The Proposed Changes were approved by the Cal/OSHA Standards Board (5 ayes, 2 nays) and will be enacted on January 1, 2025.
The full Proposed Changes language can be accessed here
The Final Statement of Reasons (including response to submitted comments) can be accessed here
All the Best -
Roxanne Fynboh
Secretary, CIHC Board of Directors