A groundbreaking study published in Nature Scientific Reports on July 15, 2026, validates that combining negative ions with ultra-low ozone concentrations delivers rapid, safe disinfection for occupied environments.
Researchers from Japan developed a novel device that generates negative ions and ozone (NIO₃) through integrated corona discharge and electron-emitting technologies . The system allows independent control of ion and ozone concentrations, enabling precise treatment for different applications.
Key Findings: 99.7% Reduction at Safe Ozone Levels
The study tested the system against Escherichia coli in controlled chamber conditions. Under standard NIO₃ conditions — 2 × 10⁶ ions/cm³ combined with just 0.05 ppm ozone — the survival rate of E. coli dropped to 0.23% after 60 minutes, representing a 99.7% reduction .
This concentration of 0.05 ppm is well below the OSHA permissible exposure limit of 0.1 ppm for occupied spaces. When ozone levels are this low, the gas can be safely used in environments where people are present — a breakthrough for commercial applications.
Why This Matters for Commercial Facilities
Traditional ozone disinfection requires high concentrations and unoccupied spaces. This often means treating rooms after hours, limiting treatment frequency and creating scheduling challenges for facilities that operate 24/7.
This new approach changes the equation. By using negative ions to enhance ozone's oxidative action, effective sterilization can be achieved at ozone levels low enough for continuous use in occupied spaces.
A 2025 Mitsubishi Electric study further clarifies the underlying mechanism: negative ions dissolve in the moisture surrounding microorganisms, lowering the pH and enhancing ozone's oxidative action, enabling strong virus and bacteria reduction even at 50 parts per billion (ppb) ozone concentrations .
Commercial Applications for B2B Buyers
Healthcare facilities can now maintain continuous disinfection in patient waiting areas, examination rooms, and corridors without requiring room evacuation.
Office buildings can reduce sick building syndrome complaints and improve indoor air quality while occupants remain at work.
Schools and universities can provide ongoing protection in classrooms, libraries, and common areas without disrupting class schedules.
Public transportation systems can treat high-traffic areas like waiting lounges and ticketing halls with continuous, safe disinfection.
The Science Behind the Breakthrough
The mechanism works through two complementary effects :
First, negative ions dissolve in the moisture film surrounding microorganisms. This lowers the pH, creating an environment where ozone remains more stable and effective.
Second, the enhanced stability allows low-level ozone to penetrate and oxidize cell membranes more effectively, achieving the same or better results than higher ozone concentrations alone.
The study also confirmed no statistically significant cytotoxicity or genotoxicity in A549 cells exposed to up to 10 times the standard NIO₃ conditions, as assessed by MTT assay, comet assay, and micronucleus test .
FEILI Positioning
FEILI Electric is at the forefront of bringing advanced ozone solutions to commercial and industrial applications. Our Ozone Disinfection Machine product line is engineered with precision control systems that allow users to maintain safe, low-level ozone output for occupied-space disinfection.
For facilities requiring continuous air treatment, FEILI's Commercial Ozone Air Purifier systems can be configured to deliver controlled ozone concentrations suitable for occupied environments, with integrated negative ion generators for enhanced efficacy.
FEILI's Ozone Generator Machine technology provides the precise dosing controls necessary to maintain ozone levels within safety guidelines while achieving effective microbial reduction — exactly what this new research confirms is both possible and powerful.
All FEILI systems feature 304 stainless steel construction, CE certification, and the precision control necessary for safe occupied-space operation. Since 2011, FEILI has supplied ozone solutions to clients in over 130 countries.
Ready to explore safe, continuous disinfection for your facility? Contact FEILI to discuss the right configuration for your application.
