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Research Update

New US Research Raises Questions About Airborne Methamphetamine Exposure

A preliminary preprint examined airborne methamphetamine in 18 previously contaminated US residences, reporting elevated concentrations at heating and ventilation supply vents.

Research Update
ByEnviroCheck Forensics

New research released in the United States suggests that methamphetamine residues in contaminated residential properties may present an additional exposure pathway through indoor air and ventilation systems.

The study, Inhalation Exposure to Methamphetamine in Contaminated Residences, by J. E. Dennison, examined 69 air samples collected from 18 previously contaminated residences.

What the Study Reported

Air samples collected
69 samples from 18 previously contaminated residences
Airborne methamphetamine concentration
0.02 – 15 µg/m³
Highest concentrations
HVAC supply vents — significantly higher than return vents or ambient indoor air
Modelled exposure
Inhalation could approximately double estimated total exposure for infants

Concentrations measured at HVAC supply vents were significantly higher than those measured at return vents or in ambient indoor air. Under the study’s exposure modelling assumptions, inhalation could approximately double estimated total methamphetamine exposure for infants.

Implications for New Zealand Properties

EnviroCheck Forensics believes these findings warrant further investigation into how methamphetamine residues interact with residential heating, ventilation and air-conditioning systems.

While New Zealand’s residential methamphetamine contamination framework uses surface-wipe measurements, the new research raises questions about whether surface measurements alone adequately characterise all potential exposure pathways.

Further investigation is needed to establish how these findings apply to New Zealand homes, particularly those using heat pumps.

Important Qualification

This study is a preliminary preprint and has not yet undergone peer review. It does not establish a new health-based testing threshold or demonstrate that New Zealand’s current regulatory limits are unsafe.

Source

J. E. Dennison (2026), Inhalation Exposure to Methamphetamine in Contaminated Residences, medRxiv.

doi.org/10.64898/2026.10.02.26364615

About EnviroCheck Forensics

Established in 2014, EnviroCheck Forensics provides independent laboratory-based methamphetamine contamination testing and property assessment services across New Zealand.

Media Enquiries

Todd Sheppard
EnviroCheck Forensics
Email: press@MethShield.co.nz
Website: envirocheck.co.nz

This research update is provided for general informational purposes only and does not constitute professional advice or a recommendation about any specific property. The cited study is a preprint that has not yet undergone peer review.

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