Air fryers have become one of the most popular kitchen appliances of the past decade. Millions of households use them daily, convinced they’re making a healthier choice by cutting oil and cooking faster. Most of the time, that’s true. However, there’s a specific mistake many people routinely make that can shift the balance from healthy to potentially harmful.
The issue isn’t the appliance itself. It’s how people use it, what it’s made of, and whether its surfaces remain intact. Understanding where the real risk lies makes a significant difference in how safely you cook.
Using a Scratched or Damaged Nonstick Basket
At normal cooking temperatures below 500°F, intact nonstick coatings do not appear to release harmful compounds in significant quantities. The risk increases if the coating is scratched, overheated, or degraded. This is the mistake most air fryer users overlook entirely. They keep using a basket that’s visibly worn, chipped, or marked from metal utensils, not realizing the integrity of the coating is what keeps it stable.
Metal utensils can scratch the nonstick coating, which not only damages the appliance but may also release unwanted chemicals into your food. Once those scratches appear, the surface is compromised. If you’re using nonstick cookware that may contain PFAS and the surface becomes scratched, flaking, or worn down, stop using it. Damage to the coating can increase the risk of PFAS and other chemicals leaching into food during cooking.
Cranking the Temperature Too High
At temperatures above 500°F, which air fryers can reach on their highest settings, PTFE begins to degrade and can release toxic fumes including perfluoroisobutylene. This is well-established and is why manufacturers caution against overheating nonstick cookware. Most users never read those cautions. They set the temperature as high as possible, assuming more heat means faster, crispier food.
PTFE is classified as a PFAS compound. It’s chemically inert at normal temperatures, but begins releasing toxic fumes above 500°F, which is a real concern with high-heat cooking, overheated pans, and families who own pet birds. Notably, PTFE fumes are acutely lethal to parrots, cockatiels, budgies, and other birds at temperatures as low as 536°F, and death can occur within minutes. For humans, the effect is less acute but still concerning with repeated exposure.
Ignoring What “PFOA-Free” Actually Means
Some consumers believe PFOA-free cookware is safe because the harmful chemical has been removed. But “PFOA-free” only means one processing chemical, banned since 2015, isn’t present. The pan almost certainly still contains PTFE, the fluoropolymer coating itself, plus GenX or other replacement processing aids with emerging toxicity concerns.
Newer PFAS chemicals introduced as PFOA replacements, including GenX and PFBS, are showing accumulation patterns in early research that concern toxicologists. The EPA has initiated review of these compounds. The label “PFOA-free” is accurate but can be misleading. Long-chain PFOA and PFOS were phased out under pressure from the Environmental Protection Agency. Companies went scrambling for alternatives and found other chemicals within the same PFAS chemical category that were slightly different. Studies are finding these new short-chain fluorotelomers could actually be more problematic.
Cooking Starchy Foods at Maximum Heat
Acrylamide is formed when foods are heated to temperatures above 120 degrees Celsius. During the heating process, a series of chemical reactions called the Maillard reaction, involving sugars and amino acids contained in food, results in the formation of acrylamide. This isn’t unique to air fryers, but air fryers can accelerate this reaction when the temperature setting is pushed too high.
Acrylamide is classified as a probable carcinogen by the International Agency for Research on Cancer. The European Food Safety Authority notes that prolonged exposure to acrylamide may increase cancer risk, though direct causation in humans remains unproven. A 2024 study found that air-fried potatoes contained slightly more acrylamide than deep-fried or oven-fried potatoes. Pre-soaking the potatoes resulted in less acrylamide across all three cooking methods. A simple 15-minute soak in cold water before cooking can meaningfully reduce the exposure.
Overcrowding the Basket and Causing Uneven Heat
Air fryers generally don’t have a lot of room inside. Overcrowding the appliance can prevent enough air circulation to properly cook the food. When air frying a large amount of food, it may be best to do so in batches rather than all at once. This is partly a food safety issue, but it also has chemical implications.
When food doesn’t cook evenly, some portions get blasted with concentrated heat while others don’t. High-temperature cooking creates chemical byproducts, including acrylamide in starchy foods and polycyclic aromatic hydrocarbons when charring occurs, that are associated with cancer in animal studies and with disease risk in humans in some exposure contexts. Hot spots in an overcrowded basket are precisely where that charring happens. Multiple reviews and lab comparisons report that air-fried food can still form acrylamide and other byproducts if food is overcooked or charred, so the cooking profile matters.
Using the Wrong Cooking Oil or Reusing Oil
Although air fryers use less oil than traditional deep-frying methods, it is crucial to handle oil safely to avoid potential hazards. Overheating or reusing oil multiple times can result in the production of harmful substances such as acrylamide and trans fats. This is one of the more overlooked risks, especially for people who spray or brush oil onto food before cooking.
When using an air fryer, ensure that you are using heat-stable oils with high smoke points like canola or avocado oil. These oils are less likely to break down or release toxic substances when exposed to high temperatures. Oils that burn easily, like extra-virgin olive oil used at max temperature, can generate harmful substances like acrolein and formaldehyde. Acrolein is a known respiratory irritant, while formaldehyde has been classified as a human carcinogen.
Skipping Ventilation While Cooking
Real-world risk is a function of user behavior, including overheating and scratching liners, model quality such as presence or absence of PFAS coatings, and ventilation in the kitchen. Many people use their air fryers in small, enclosed kitchens without opening a window or running a vent. Even under safe temperature conditions, cooking in a closed room concentrates any fumes that do occur.
A lesser-known risk of Teflon is something called Teflon flu, or polymer fume fever. This condition occurs when nonstick coatings like Teflon are overheated and release toxic fumes. Inhalation of these fumes can cause flu-like symptoms such as headaches, fever, chills, and breathing difficulties. Even if you’re not overheating deliberately, poor ventilation raises the ambient concentration of any compounds that are released. According to America’s Poison Centers, over 265 probable instances of polymer fume fever were reported in 2023, the most incidents since 2000.
Never Running a New Air Fryer Before First Use
It is advisable to run a new air fryer empty for 15 to 20 minutes in a well-ventilated area, like near an open window, before cooking any food in it for the first time. This cures the appliance and burns off any residual manufacturing oils or coatings. Most people skip this step entirely, going straight from unboxing to cooking their first meal.
Recycled plastic can be used in air fryers and can come from recycled electronic waste which can contain substances of concern, including antimony, toxic flame retardants, PFAS, phthalates, bisphenols, cadmium, chromium, mercury, and lead. A pre-use burn-off cycle helps clear any residual factory chemicals or manufacturing residues from both the interior coating and plastic housing before food ever makes contact with the cooking surface.
Buying Budget Models Without Checking Materials
Pay attention to what the air fryer is made from. Lower-quality models may use materials that can leach harmful chemicals. Check to make sure your air fryer is free from PFOA and BPA. The market is filled with inexpensive models that make broad marketing claims without transparent ingredient labeling, and not all brands are willing to confirm exactly what their coatings contain.
What research has found during investigation is that companies who are still using nonstick coatings are not always willing to provide the exact materials used in their products. Experts have identified cancer risks related to high levels of certain chemicals found in some air fryers. Several models contain polyfluorinated molecules, also known as forever chemicals, in the nonstick coating of the basket. Scientific studies have established the health risks of exposure to high levels of per- and polyfluoroalkyl substances, showing links to health problems including infertility, hormone disruption, and some types of cancer. Knowing your model’s coating is basic due diligence, not an overreaction.
What You Can Actually Do About It
As of January 1, 2025, Minnesota became the first state to ban the sale of nonstick cookware coated with PFAS. Vermont, Connecticut, Rhode Island, and Colorado are moving ahead with bans or restrictions on cookware containing intentionally added PFAS, with enforcement dates ranging from 2026 to 2028. The regulatory landscape is shifting, which is a useful signal that the concern is real enough to warrant legislative action.
Air fryers are not categorically toxic. They can be a healthier alternative to deep frying by cutting fat and lowering some hazardous byproducts, but they carry material and temperature-related risks that are avoidable: choose PFAS-free or ceramic and stainless steel interiors, avoid overheating and charring, do not use damaged nonstick surfaces, ventilate cooking areas, and prioritize a varied diet to reduce cumulative exposure to acrylamide and other compounds.
To minimize acrylamide production, try to fry at temperatures no higher than 338°F. As a general rule, to reduce acrylamide formation, consider shortening the cooking time, avoiding over-browning or burning, and using lower cooking temperatures. These aren’t dramatic lifestyle changes. They’re small, practical adjustments that genuinely reduce your exposure without giving up the convenience you bought the appliance for in the first place.
The air fryer isn’t the villain here. Used correctly, with the right materials and a bit of attention to temperature and maintenance, it remains one of the better cooking tools available. The real problem is the assumption that owning the appliance is enough. A scratched basket, a forgotten pre-season burn, or a habit of pushing temperatures to the maximum are the things that actually put chemicals in your food. That’s a fixable problem, and it starts with knowing it exists.
