Dear Colleague,
In this issue of Trends, we provide several articles on the topic of product safety and stewardship – the practice of responsibly managing a product’s health and safety and environmental and regulatory impacts throughout all its life cycle stages – and the use of exposure and risk assessment to support that safety and stewardship practice.
Our first article discusses the importance of conducting proactive risk assessments for wearable electronic devices. Our second article explores the potential for small particles to enter the brain through the nose-to-brain pathway. Our third article examines potential sources of air emissions and health risks associated with a battery energy storage system (BESS) and ways they are being evaluated and mitigated. Our fourth article looks at methods for identifying and managing nitrosamines in consumer products.
Gradient contributors to this Trends issue include Drs. Nicholas Drury, Peter Andrew, and Steven Boomhower, ERT, ATS; Seth Larch; Christopher DesAutels, M.S.; Charlotte Marsh, M.S., CPPS, DABT; and Pranav Mashankar, M.S.
We hope this issue of Trends leaves you with a greater understanding of the important role exposure modeling and risk assessment play in product safety and stewardship.
Yours truly,
Chris Long, Sc.D., DABT, and Kurt Herman, M.Eng., P.G.
Chris.Long@gradientcorp.com Kurt.Herman@gradientcorp.com
The next issue of Trends will focus on:
Toxic Substances Control Act (TSCA)
Do you have a scientific topic that you would like Gradient to write about in Trends? Send us your ideas for future Trends topics: trends@gradientcorp.com.



