# OEHHA adopts NSRL for airborne titanium dioxide particles

California Proposition 65 (Safe Drinking Water and Toxic Enforcement Act of 1986)  
Office of Environmental Health Hazard Assessment (OEHHA)

**Announced**  
Jun 18, 2025

**Effective**  
Oct 1, 2025

**Implementation**  
Oct 1, 2025

## Description

OEHHA adopted a No Significant Risk Level (NSRL) for Titanium Dioxide (airborne, unbound particles of respirable size) under Proposition 65. The NSRL establishes a safe harbor level for cancer risk from inhalation exposure, allowing businesses to determine if exposures require Proposition 65 warnings. The regulation was approved by the Office of Administrative Law on June 18, 2025 and took effect on October 1, 2025.

## Sources

- Official [Proposition 65: No Significant Risk Levels for Titanium Dioxide (airborne, unbound particles of respirable size)](https://oehha.ca.gov/proposition-65/crnr/proposition-65-no-significant-risk-levels-titanium-dioxide-airborne-unbound-particles-respirable)

## Key Findings

OEHHA adopts NSRL for airborne titanium dioxide particles