Paradichlorobenzene: Read Deodorizer Labels Carefully

A solid deodorizer can look like a simple way to keep a bathroom or cupboard smelling fresh. Yet the ingredient doing the work may slowly enter the air you breathe. One name worth recognizing is paradichlorobenzene, also called p-dichlorobenzene or 1,4-dichlorobenzene.

On August 6, 2026, the U.S. Environmental Protection Agency (EPA) released a draft risk evaluation that identified inhalation from certain air-care products containing this chemical as contributing to unreasonable consumer risk. That is a preliminary assessment, with a final decision still ahead. It gives shoppers a concrete reason to check what a deodorizing product contains. [4, 5]

The same chemical can also be an active ingredient in mothballs. Those products have a different purpose and regulatory framework. Understanding the difference helps you read the label and choose the right response for the product actually in front of you.

What Is Paradichlorobenzene?

Paradichlorobenzene is a crystalline solid with a strong odor. EPA identifies its chemical registry number as 106-46-7. It can change directly from a solid into vapor at room temperature, a process called sublimation. That makes inhalation a relevant route of exposure even when nobody sprays the product. [5]

The naming can be confusing. On a package or manufacturer document, you may encounter:

• Paradichlorobenzene
• p-Dichlorobenzene or pDCB
• 1,4-Dichlorobenzene

These names identify the same substance. Other forms of dichlorobenzene have different chemical arrangements, so a finding about one should not automatically be transferred to another.

Think of the registry number as a useful cross-check when the spelling changes. It can help you match a package with a safety data sheet, but it does not tell you the product's concentration or how much reaches the air in your home.

What Did EPA Find in 2026?

EPA's August draft evaluated specified uses under the Toxic Substances Control Act (TSCA). The agency preliminarily identified chronic inhalation exposure from air-care products as contributing significantly to unreasonable consumer risk. It also identified risks in several workplace uses. [5]

The important consumer detail is the scenario: a product releasing the chemical into indoor air during use. The assessment is not an air measurement in your bathroom, and it does not establish that every deodorizing product contains pDCB.

EPA described the findings as draft conclusions that may change after public comment and further evaluation. Existing safeguards and product directions remain in place. If the final evaluation continues to find unreasonable risk, a separate risk-management process would follow. EPA is working toward a February 12, 2027 deadline for the final evaluations. [4]

For now, a headline about a review should prompt a label check rather than an assumption that a nationwide sales ban has already taken effect.

Air-Care Products and Mothballs Need Different Questions

For an air-care or deodorizing product, ask what chemical it releases and whether you need that product for the task. Covering an odor can leave its source unresolved. A persistent smell may deserve a cleaning or maintenance check rather than another scented block.

For mothballs, ask what pest the product is labeled to control and where the instructions allow its use. The National Pesticide Information Center (NPIC) explains that U.S. mothballs generally contain high concentrations of either paradichlorobenzene or naphthalene. Both slowly release fumes, but they are different chemicals. [1]

Mothballs are pesticides. Their legal use is governed by the label; they are not general household deodorizing supplies. The TSCA review applies to the uses EPA evaluated and excludes uses outside that law's chemical definition, including pesticide uses. A conclusion about an air-care scenario therefore should not be presented as a new mothball authorization or prohibition. [2, 5]

This distinction matters when reading online advice. A product's shape—ball, bar, cake, or crystal—does not settle what it is for. The labeled purpose and active ingredient do.

How to Check a Product You Already Own

Start with the physical package. Check the ingredient or active-ingredient panel, warnings, instructions, and intended location of use. If you need more detail, look for a manufacturer ingredient disclosure or safety data sheet that matches the exact product name.

Keep these checks specific:

1. Match the formula. A document for a different scent, country, or product version may describe different ingredients.
2. Search the full name. Do not rely on a broad word such as “chlorine” or on whether the package says “fresh.”
3. Check the use instructions. A product intended for one enclosed storage application should not be repurposed elsewhere.
4. Ask a precise question if disclosure is unclear. “Does this formula contain paradichlorobenzene, CAS 106-46-7?” is easier to answer than “Is it chemical-free?”

An unreadable or missing ingredient list is a reason to seek reliable information. It is not evidence that the ingredient is present. Likewise, absence from an incomplete online listing cannot confirm absence from the formula.

Avoid Common Mothball Misuses

NPIC says mothball labels typically require a tightly closed container so the fumes stay inside the storage space. An open closet or a poorly sealed bag can let those vapors enter living areas. Mothballs should not be used around food or food-preparation areas. [2]

Do not scatter them around a room, garden, attic, or vehicle based on a social-media pest-control tip. Oregon State University Extension identifies these as examples of misuse and advises using the product only for the pests and locations specified on its label. [3]

For storage, the useful habit is to read the directions before placing the product anywhere. Keep the package available so you can follow its handling and disposal instructions later. If you cannot establish how an unlabelled product should be used, do not improvise a new use.

Practical Alternatives Start With the Task

Reducing exposure need not mean buying a replacement chemical with a different marketing claim. For clothes storage, Oregon State University Extension recommends cleaning garments according to their care instructions and storing them in airtight containers. It also describes cleaning and vacuuming as parts of managing clothes-moth problems. [3]

For odor control, write down what you are trying to solve before shopping: a dirty surface, a storage problem, or an odor whose source you cannot identify. That gives you a better comparison than choosing whichever product promises the strongest fragrance.

When comparing two products, check the exact formula and directions for both. “Natural,” “fresh,” or “pDCB-free” answers only part of the question. A substitute may have different ingredients and use requirements, so it deserves its own label read.

Our guide to identifying chemicals in everyday products explains the wider label-reading process. For another example of why a chemical name needs context, see aluminum in deodorant and antiperspirant.

You can use Toxic Scan as a starting point for understanding ingredient names where the product label is available. Keep the package directions and manufacturer information alongside that explanation: a scan cannot measure indoor-air concentrations or determine whether a particular use matches a pesticide label.

What to Take Away

Paradichlorobenzene can enter indoor air from products that slowly release vapor. EPA's 2026 draft identifies a concern in the air-care uses it assessed, while the evaluation and any later regulatory response remain separate stages.

Check for the full ingredient name, identify the product's purpose, and follow its directions. For moth protection, consider cleaning and enclosed storage first. For an odor, address the task itself rather than assuming that adding a deodorizer solves it.

References

1. National Pesticide Information Center. (2025). “Mothballs: Chemical Properties and Environmental Fate.” Oregon State University. https://npic.orst.edu/ingred/ptype/mothball/chemprop.html 2. National Pesticide Information Center. (2025). “Regulation, Proper Uses, and Alternatives of Mothballs.” Oregon State University. https://npic.orst.edu/ingred/ptype/mothball/regulation.html 3. Stone, D., & Stock, T. (2008). “Mothballs: Proper Use and Alternative Controls for Clothes Moths.” Pacific Northwest Extension, PNW 606. https://extension.oregonstate.edu/catalog/pnw-606-mothballs-proper-use-alternative-controls-clothes-moths 4. U.S. Environmental Protection Agency. (2026). “EPA Releases Draft TSCA Risk Evaluations for Two Chemicals Found in Household and Commercial Products.” EPA. https://www.epa.gov/chemicals-under-tsca/epa-releases-draft-tsca-risk-evaluations-two-chemicals-found-household-and 5. U.S. Environmental Protection Agency. (2026). “Risk Evaluation for p-Dichlorobenzene.” EPA. https://www.epa.gov/assessing-and-managing-chemicals-under-tsca/risk-evaluation-p-dichlorobenzene