We Found The Best Non-Toxic Air Fryers (14+ Products Analyzed)

Drawing from our extensive research and in-depth analysis conducted of 14+ of the most popular air fryer brands, we present a definitive guide to the most popular air fryers, with a strong emphasis on material safety.

If you’re looking for a non-toxic air fryer, you have plenty of choices. But which ones are truly non-toxic?

When selecting a non-toxic air fryer, you have to consider materials and coatings. Not all are equally safe. In fact, some are extremely dangerous to health. Unfortunately, not all air fryer companies are transparent about their products. So what can you do?

In this article, we dig deep to uncover which air fryers are truly non-toxic so you don’t have to. View our email exchanges and phone call transcripts with leading air fryer companies. Judge them for yourself. Then you can be confident about purchasing a non-toxic air fryer that lives up to its name.

The Best-Rated Air Fryers For Safety

After our deep analysis of 14 brands of air fryers, these are the ones we can recommend for material safety. Any of the products listed below are safe to use.

Brand	Material	Price	Where to buy
Big Boss	Glass (16 qt.)	$90	Amazon
Classic Cuisine	Glass (12 qt.; 17 qt. with extender ring)	$55	Amazon
NutriChef	Glass (18-qt.)	$65	Amazon
Wisfor	Glass (12 qt; 17 qt. with extender ring)	$130	Amazon
Aroma	Glass (3 qt.)	$60	Amazon
Yedi	Stainless steel (6 qt)	$140	Amazon
Geek Chef	Stainless steel (15 qt.)	$170	Amazon
Hamilton Beach	Stainless steel	$60	Amazon

Worst Air Fryers

We’ve carefully looked at the materials used by top air fryer brands listed below. Sadly, our deep check found some safety issues. We discovered that these brands use materials that might not be safe. So, we suggest skipping these brands for your own safety.

Brand	Materials	Price
Corsori	Teflon, aluminum (5 qt.)	$80
Dreo	Stainless steel, silicone, unknown non-stick coating	$64
Instant Pot	Stainless steel, Teflon	$120
Breville	Stainless steel, enamel, unknown non-stick coating	$350
Philips	Plastic, titanium	$197
Ninja	Ceramic coating	N/A

The Best Glass Air Fryers

Glass air fryers are our preference for most likely being completely non-toxic, because they allow you to see what’s inside. They don’t have interior coatings like stainless steel air fryers may have, but it’s always smart to ask customer service if you have any doubts at all. 

Pay special attention to the inside bottom of glass air fryers. If there’s something resembling a pan to catch drips, check out what it’s made of. The user manual may have this information, but if not, email or call the company.

Racks and trays for use inside the glass air fryer may have questionable coatings on them. Sometimes, you can tell from a visual inspection. If you’re not sure, always contact the company before purchasing to be sure the glass air fryer is truly non-toxic.

Borosilicate glass is the best for an air fryer because it resists thermal shocks. The glass bowl will be heavy, perfectly clear, and scratch-resistant. By contrast, soda lime glass will be lighter, possibly have a blue-green tint around the edges, and will scratch easily (try it with a triangular file).

Big Boss

We like the Big Boss because it appears to be all glass with stainless steel accessories. The well-labeled diagram suggests no coatings are used. However, it’s not clear whether the basket contains a non-stick coating or not. In one place in the product description, it states it does, but in another place, it does not. We reached out to Big Boss through their website and will report back here with their answer. Uses a 1300W infrared heating.

Materials	Glass (16 qt.)
Made In	China
Accessories	2-tiered racks, mesh basket, extender ring, recipes
Price Range	$90
Where To Buy	Amazon

Classic Cuisine

The Classic Cuisine air fryer appears to be a non-toxic appliance. It runs on 1200W, combining halogen, convection, and infrared technologies for heating. It’s not our top choice because there’s no way to contact the company with questions or for troubleshooting help.

Materials	Glass (12 qt.; 17 qt. with extender ring)
Made In	China
Accessories	Frying pan, dual cooking racks, lid holder, tongs, and recipe manual
Price Range	$55
Where To Buy	Amazon

NutriChef

Using a halogen lamp, this NutriChef air fryer AZPKCOV45

uses 1000W. We like the fact that NutriChef has a website with a user manual link and contact information if you have questions or concerns. Look here for their response on coatings.

Materials	Glass (18-qt.)
Made In	China
Accessories	2-tiered cooking racks, tongs
Price Range	$65
Where To Buy	Amazon

Wisfor

Although Wisfor does not have its own website, there is a customer service contact number included. Amazon reviewers speak highly of Wisfor’s service.

We like the fact that there is a large, fully labeled diagram showing all the parts, accessories, and features of this air fryer. All of the parts appear to be stainless steel. If we find out differently, we’ll let you know. This air fryer uses a 1300W halogen lamp.

Materials	Glass (12 qt; 17 qt. with extender ring)
Made In	China
Accessories	4 Baking needles, Dual Racks, Extender ring, Stove rack, Bread rack, Tongs, Steam Basket and User Manual
Price Range	$130
Where To Buy	Amazon

Aroma

We’re including this small, glass air fryer for people who are searching for a compact, energy-efficient (900W) solution. Although we appreciate Aroma having a website with user manual links and active customer support, we must warn you: the frying basket looks like it’s coated with Teflon. Although on the Aroma site, there’s a post about their glass frying basket, so we’re confused. Also, it appears that their rack is Teflon-coated. We’ve reached out to Aroma to get definitive answers and will update this entry when we do.

If you’d like to substitute the Teflon-coated accessories with stainless steel inserts that you purchase separately, this will be a way to make this appliance non-toxic. Just make sure they’ll fit inside!

Materials	Glass (3 qt.)
Made In	China
Accessories	frying basket, rack
Price Range	$60
Where To Buy	Amazon

Best Stainless Steel Air Fryers

As a non-toxic material, you can’t go wrong with stainless steel kitchen appliances, including air fryers. Often, accessories will be made of galvanized steel. This means it’s been coated with zinc to protect against rust.

Zinc is an element needed by the body. If a small amount leaches into your food (unlikely) it will not be toxic. Be aware of the use of “metal” to describe the material. Always ask for the specific metal used. Avoid aluminum, a neurotoxin.

Yedi

Although the Yedi Tango is small, it comes with plenty of accessories that appear to be stainless steel without non-stick coatings. When we hear back from Yedi, we’ll update this entry. People looking for an air fryer-pressure cooker combo will like this model. Operates on 1500W. 

Materials	Stainless steel
Made In	China
Products	Two egg racks/steaming trivets, a frying basket, ladle, rice paddle, cooking mitts, extra silicone sealing ring, steaming basket, inner cooking pot, measuring cup, recipes
Price Range	$140
Where To Buy	Amazon

Geek Chef

The word “non-stick” does not appear anywhere on Geek Chef’s product page for this air fryer so we’re assuming the accessories are stainless steel. We’re guessing this information would be in the user manual, but the link on the website opens to a PDF that is not legible. We’ve reached out to them and will report back here if we get a response.

Materials	Stainless steel (24 qt.)
Made In	China
Accessories	Baking pan, fryer basket, rack, drip tray, recipes
Price Range	$170
Where To Buy	Amazon

Hamilton Beach

Nothing on the Hamilton Beach website suggests their accessory pans and trays are coated with Teflon. What we like about them is a special page where you can find out more on the product formulation of any appliance. When we looked up model number 31403 for this air fryer-toaster oven combo, Teflon was not listed. We also contacted customer service to confirm this. Check back here for their reply. 

Materials	Stainless steel
Made In	China
Accessories	Basket, pan, rack, recipes
Price Range	$60
Where To Buy	Amazon

Emeril Lagasse

An appliance which functions as an air fryer and so much more but only uses 1500W, it appears everything is stainless steel. We contacted customer service through their website and will post an update here.

Materials	Stainless steel
Made In	China
Products	Basket, rotisserie spit, rack, pan, drip tray
Price Range	$163
Where To Buy	Amazon

What is an Air Fryer? (And Why They’re a Great Invention)

Technically, an air fryer is a countertop convection oven. Instead of oil, an air fryer uses hot air circulating around your food—like French fries or fried chicken—to bring them to a delicious crisp. 

Another way to think of an air fryer is like a deep fryer without the oil. With no excess liquid fat soaked up by your food like conventional frying, air-fried foods are healthier. You never have to worry about harmful trans fats or loads of extra calories. So, go ahead and splurge on air-fried foods!

Foods prepared by air fryers are also healthier because they contain less carcinogenic acrylamide and polycyclic aromatic hydrocarbons (PAHs).

These harmful chemicals may be produced when you fry foods. Contrary to popular opinion, you do not have to burn foods to form them. There could be cancer-causing chemicals in very crispy foods.

Lastly, air fryers are great for your mental health because they reduce the stress of cleanup. No splattered oil on walls or stovetops. No oil-saturated paper towels from letting fried foods drain. So, you’ll have more free time to spend with your family doing fun activities instead of kitchen cleaning.

PFAS Coatings in Air Fryers  

The most toxic coating in an air fryer—just like in cookware and cookware utensils—is made of per- or polyfluoroalkyl substances (PFAS). Because they persist and accumulate indefinitely in the human body and the environment, PFAS are called forever chemicals. Research shows that over 95% of all living beings everywhere on the planet have some PFAS in their bodies.

Lab-made in the 1930s, PFAS have become commonplace in all sorts of consumer products. Teflon, the first non-stick coating, is the most famous. Chemically, it consists of polytetrafluoroethylene (PTFE). There are many other brand names for PTFE that you may see on products, including Fluon, Hostaflon, and Polyflon. 

According to the Environmental Working Group (EWG), Teflon patent holder, DuPont, conducted early studies showing Teflon releases toxic airborne particulates at 464°F. At 680°F, Teflon emits at least six toxic gases, including two carcinogens and a perfluoromethylalkoxy copolymer (MFA), which kills humans at low doses. On stovetop drip pans—which can reach 1000°F—Teflon breaks down to chemical warfare agents perfluoroisobutene (PFIB) and a chemical cousin of phosgene (nerve gas).

EWG, in conjunction with an independent food scientist, performed studies which showed stovetop cooking temperatures can quickly exceed 721°F in five minutes. Here’s a graph showing their results:

Better Goods conclusion: PFAS in cookware heated above 464°F are hazardous to the health of humans and pets, especially birds. That temperature is easily reached in kitchens everywhere—including yours.

Some of the negative health outcomes associated with PFAS include:

• Hormonal imbalances
• Reproductive abnormalities
• Kidney, bladder, and testicular cancer

After reading this information, you may be surprised to hear that PFAS are not regulated in the United States. At all. They have not undergone extensive, long-term safety testing by the government or an independent, third-party laboratory before being approved for general use. 

Because all PFAS have similar chemical and biological reactivities, erring on the side of caution dictates avoiding all of them as a general class of substances. Currently, there are approximately 10,000 different PFAS in existence. 

Unfortunately for unsuspecting individuals, PFAS do not have to be labeled on products containing them. 

In 2023, after decades-long pressure from environmental and public health groups, the United States Environmental Protection Agency (EPA) finally proposed drinking water standards for a handful of PFAS. However, these maximum permissible levels do not apply to forever chemicals in consumer products such as underwear, sports bras, food packaging, and—you guessed it—air fryers. 

Meanwhile, the European Union (EU) is considering a near-total ban on all forever chemicals in almost all products. Some EU member states acknowledge the serious adverse health effects associated with PFAS, and are willing to abolish their use. Some products will become obsolete. 

In the 2010s, a “new,” purportedly less toxic group of PFAS, collectively known as GenX, took the place of two voluntarily (by industry) discontinued PFAS: PFOA and PFOS. Up until a few years ago, PFOA and PFOS were used as processing aids to make Teflon (PTFE). But they were discontinued because they had been proven to cause cancer and birth defects in people frequently exposed to high doses. 

Unfortunately, GenX, now used to manufacture Teflon, has been found to be more toxic than the original PFAS used to make it. As a result, Better Goods recommends that you avoid all PFAS in all consumer products, especially those used to prepare meals. 

Ceramic Coatings in Air Fryers  

You may think of ceramic (clay) as non-toxic since it is natural. This is not a valid assumption. 

If an air fryer coating is constructed of pure ceramic (clay), the major concern is whether it’s contaminated by heavy metals such as lead or cadmium. You cannot be sure—unless you receive assurance from a manufacturer—that the clay used to make the ceramic coating in your particular air fryer has been third-party tested for heavy metals. As a purchaser, it’s up to you to decide whether that’s a risk you’re willing to take. Better Goods has not yet found an air fryer constructed of pure clay.

Instead, you’ll find lots of cookware—including air fryers—made with ceramic coatings. Unfortunately, there are several good reasons to avoid ceramic coatings on air fryers. 

First, most manufacturers are not completely transparent about all the components of their coatings, and ceramic coating makers are no exception. Even requesting a materials safety data sheet (MSDS) may not reveal all of the substances in a coating. On the MSDS, the word proprietary often appears instead where the component names should be. Similarly, when customer service reps use the term on the phone, that’s the end of discussion. You’ll never find out what’s in the coating.

There are many ceramic coatings on the market today. A casual internet search will pull up at least ten different types. Unfortunately, you cannot know which one is on any particular air fryer.

Ceramic coatings are typically manufactured by a sol-gel process. The specific starting materials used to make the coating often vary from brand to brand. So, too, do their relative amounts, the laboratory conditions under which sol-gel occurs (pH, temperature, solvent, additives, catalysts, etc.), and the duration of each of the steps as well as the entire process. All of these dissimilarities result in differences in how well the coating adheres to the air fryer’s base material, how durable it is, and how long it will last before wearing off. 

Here is a diagram of the sol-gel method of making ceramic coatings:

What all sol-gel processes have in common is that particles of metal alkoxides, usually silicon- or titanium-containing compounds (like tetraethoxysilane (TEOS)), are used to produce metal nanooxides (like nano-silicon dioxide). These are extremely tiny (ultrafine) chemicals collectively known as nanoparticles. They range in size from 0.001-0.1 micron. (For comparison, the width of a human hair is approximately 70 microns.) 

Basically, in sol-gel, particles suspended in a liquid (sol) undergo chemical reactions and join together to form long chains of atoms with a metal-oxygen backbone, and transition to a solid state (gel). Sol-gel creates thin films of nanoparticles with a thickness of 50–500 nm. It can also be used to make glass or ceramic powder of SiO₂ or TiO₂.

The safety concerns over ceramic coatings have to do with the nature of the starting materials and the size of the final products.

TEOS in Sol-Gel

TEOS, the common starting material in making a ceramic coating, possesses these hazards:

• Flammable liquid and vapor
• Causes serious eye irritation
• Toxic if inhaled
• May cause respiratory irritation

Fortunately, unreacted TEOS usually isn’t left in the final coating. The sol-gel process results in a high (99.9%) purity level of the final metal oxides, so if TEOS is present, it’s only there in tiny amounts. But still, it makes us uneasy to think such a hazardous chemical as TEOS is used to make the “non-toxic” ceramic coating on an air fryer.

Nanoparticles in Ceramic Coatings 

Ceramic coatings made by the sol-gel process contain nanoparticles (NPs) of minerals such as silicon dioxide and titanium dioxide. 

As described above, nanoparticles are so small they are invisible to the naked eye. Widely touted as one of the biggest tech trends of the 21st century, you can now find NPs in items as diverse as:

• Scratch-resistant glasses 
• Crack-resistant paints
• Transparent sunscreens
• Stain-repellent fabrics
• Ceramic coatings for solar cells  

However, just because a substance has many beneficial uses does not make it non-toxic.

In fact, a 2011 article published in the journal Radiology and Oncology showed that titanium dioxide nanoparticles (nano-TiO₂) have the following effects in animal studies: 

• Possibly carcinogenic
• Induces oxidative stress resulting in cell damage, genotoxicity, inflammation, and altered immune response

In light of these findings, the study’s authors recommend: “Until relevant toxicological and human exposure data that would enable reliable risk assessment are obtained, TiO₂ nanoparticles should be used with great care.”

Echoing this warning, Better Goods advises readers to avoid using products—including ceramic-coated air fryers— made with nanoparticles.

A 2018 study from the journal Food Control confirms our conclusion. Using cookware made with ceramic coatings, the researchers found that significant amounts of titanium dioxide nanoparticles and silicon dioxide nanoparticles were released into slightly acidic liquids. They were also released when the surface was scratched.

Ceramic coatings can be applied to most metallic surfaces, such as stainless steel, aluminum, and iron. Although sol-gel ceramic coatings are marketed as resistant to chipping or breakage, regular use with metallic utensils or abrasive cleaning will damage this coating, thereby exposing the metal underneath. 

Over time—sometimes in a matter of weeks—the coating will entirely wear off. When that occurs, leaching of the base metal into foods at high temperatures is possible. Aluminum leaching is the worst offender because this metal is a neurotoxin. 

Graphene Coatings in Air Fryers  

Digging further, Better Goods uncovered a 2015 patent application for a “graphene non-stick coating…used for kitchenware with a ceramic or metal base” titled Graphene non-stick coating and application thereof. 

Graphene is a newly discovered material made of a single layer of carbon atoms in a hexagonal arrangement. It’s stronger than steel, an excellent heat conductor, and possesses non-stick properties. So, you can see why graphene would be a good candidate for a non-stick coating.

The components in the graphene non-stick coating described in the patent application are:

• graphene powder
• silica gel
• polytetrafluoroethylene (PTFE)
• polyester modified epoxy resin
• silicone oil
• black iron oxide
• spherical ceramic micro powder
• aluminum oxide
• aluminum nitrate 
• deionized water.

So, this non-stick coating is not a true fluorographene that contains fluorine but doesn’t contain PFAS. Since it contains PTFE, it’s better described as a “new” Teflon. Yet, the presence of ceramic suggests it could be called a ceramic, too! 

Better Goods hasn’t found an air fryer with a graphene coating yet. Be on the lookout for it, like this graphene-coated fryer. 

Given the many health problems associated with graphene, it doesn’t seem that we would recommend it as a non-toxic air fryer coating if it ever makes it to the market.  

Air Fryer 101: A Crash Course in Safe Materials

As described in our article on the best non-toxic cookware, glass and stainless steel are two of the safest materials to use in the kitchen for cooking, especially at high temperatures. This general rule applies to air fryers as well. 

Preparing food in an air fryer at sustained higher temperatures approaching or temporarily exceeding 500℉ compared to temperatures in a conventional stove or oven (350-400℉) means choosing materials carefully is even more important. 

There are several materials-like plastics and Teflon-which break down at higher temperatures. When that happens, these materials leach harmful chemicals into foods or send toxic fumes into your home.

Non-Toxic Glass

Borosilicate glass is made from silica (SiO2, sand) and boron oxide (B2O3, mineral). This particular chemical composition means borosilicate glass doesn’t undergo thermal shock and crack when exposed to rapid temperature changes, making it an excellent material for cookware. Air fryers are no exception. 

Being resistant to thermal shocks means you can safely take objects made of borosilicate glass from the fridge and put it in the oven—or vice versa—without worrying. Unfortunately, you can’t say the same about soda lime glass or crystal glass.

And while you’re whipping up culinary creations at high temperatures in borosilicate glass, there’s no need to be concerned about the leaching of toxic chemicals from borosilicate glass to food. This is not the case with other materials used for cookware, like those with non-stick coatings.

Other qualities that make borosilicate glass superior as a safe material for food contact are:

• Durability
• Corrosion resistance
• Non-reactivity to foods
• Impervious to food stains or odors

Non-Toxic Stainless Steel

Food-grade stainless steel, also called grade 304 or 18/8, is heat- and corrosion-resistant. This means stainless steel pots and pans won’t melt or rust. You can even put them in the oven up to 500℉ without damaging them as long as the handles are all-metal. Manufactured mostly from iron, 18/8 stainless steel also contains 18% chromium and 8% nickel. 

Other qualities which make stainless steel perfect for air fryers include: 

• Durability
• Lightweight
• Non-reactive to most foods
• Emits no toxins when heated

Since stainless steel doesn’t conduct heat very well, cookware (including air fryers) often has an aluminum or copper core sandwiched between layers of stainless steel to enhance heat dispersion.

As long as there is no damage that exposes the inner core, leaching of these metals into food isn’t possible. On the other hand, highly acidic foods (like tomato sauce) could cause leaching of a small amount of nickel when heated for a long time.

Toxic Air Fryers: The Ones To Avoid

At Better Goods, we strive to find the most non-toxic air fryers to keep you and your family safe. We don’t follow the crowd and call “best” what is clearly inferior to other choices that we’ve profiled.

For us, when it comes to air fryers, materials and coatings are everything. For example, if an air fryer uses non-anodized aluminum baskets and racks covered in Teflon, we cannot in good conscience call it the best even if it’s considered top-of-the-line and non-toxic by others. 

Aluminum, especially non-anodized aluminum, can leach into foods at high temperatures once its coating wears away, is degraded by high heat, or is damaged by abrasive cleaning. Teflon itself is toxic. The two together do not make for a good combination in an air fryer.  

Similarly, we don’t see the need to use other materials, like silicone gasket protectors, which add to the number of potentially toxic substances. Better Goods discussed the unknowns surrounding silicone, especially at high heat, in our guide to non-toxic cooking utensils. So, if a company with otherwise good reviews from others uses silicone inside their air fryer, we cannot say they produce one of the best non-toxic air fryers.

Corsori

We were surprised to read in their product manual that Corsori, one of the top names in air fryers, uses aluminum fry baskets and racks coated in Teflon. We reached out to Corsori by email to see if any of their air fryers come with uncoated stainless steel fry baskets and racks. When we hear back, we’ll update this post.

We’ve also seen reviews, unlike for many other brands, of a plastic odor that won’t go away and enters the food months after using it despite repeated washings with soapy water and running the machine at high heat per Corsori’s instructions.

Materials	Teflon, aluminum (5 qt.)
Made In	China
Accessories	Frying basket, rack, recipes, user manual
Price Range	$80

Dreo

Dreo has a website and customer support, and we appreciate that. We’ve reached out to them for the name of the non-stick coating on their plate, and will report back once we get a response. What we find doubly scary is this statement on their site: “Double non-stick, water-based coating.” There is a question on their FAQ page about their silicone protectors. Here is their answer verbatim (which we can’t understand): “We recommend that do not remove the silicone protectors so that the plate will directly touch the bottom of the basket and cannot isolate the oil.” 

Materials	Stainless steel, silicone, unknown non-stick coating
Made In	China
Products	Frying basket, plate, recipes, user manual
Price Range	$64

Instant Pot (Vortex)

The Instant Vortex air fryer receives high ratings as one of the best non-toxic air fryers out there today. However, when we read on their website page about their product: “The coating materials for the cooking trays and drip tray do contain PTFE, also known as Teflon,” we instantly demoted this air fryer.

Materials	Stainless steel, Teflon
Made In	China
Accessories	Non-stick drip pan and two perforated cooking trays, stainless-steel rotisserie basket, rotisserie spit and forks, and lift tool, recipes
Price Range	$120

Breville

Made by Breville, the Smart Oven Air Fryer features an enamel pan and others with a non-stick coating. The specific type of nonstick coating isn’t listed on the website. We have requested this information and will report it here if we get a response. The enamel coating may be problematic if it contains heavy metals. Enamel is also prone to cracking at high temperatures for long periods of time.

The saving grace with the Breville air fryer is that it sells stainless steel mesh baskets separately. Too bad they’re not included with the air fryer. 

Materials	Stainless steel, enamel, unknown non-stick coating
Made In	China
Products	Fry basket, enamel roasting pan, non-stick pizza pan, wire rack, broiling rack
Price Range	$350

Philips

Titanium coatings on the Philips Premium Airfryer XXL are potentially hazardous to health as described in a preceding section. We cannot recommend an appliance with this type of coating no matter how many rave reviews it earns.

Materials	Plastic, titanium
Made In	China
Accessories	Frying basket
Price Range	$197

Ninja

Although Ninja is another top name in air fryers, we are concerned that its accessory pans have a ceramic coating. As detailed in an earlier section, ceramic coatings contain nanoparticles that are believed to have an adverse effect on health.

We have requested more information from Ninja about its coating and will update this article when we hear back. It seems that you’d be able to use your own pans in the Ninja. So, if you like the brand but not the coatings, you could swap out accessories and use safer ones.

Materials	Stainless steel
Made In	China
Accessories	Chrome-plated wire rack, sheet pan, fry basket, crumb tray
Price Range	$147

Key Takeaways on Non-Toxic Air Fryers

When you have so many choices in air fryers, it’s confusing to sort out what’s toxic or non-toxic. You especially have to consider materials and coatings.

Based on our research, stainless steel and glass air fryers are your best choices. Both of these materials usually have not been coated with toxic substances such as PFAS, but there are exceptions. Read product information carefully and contact the company with questions to be sure.

Coatings on air fryers may be toxic. PFAS top the list. If there are any PFAS used on the product, it is best to reject it.

Nanoparticle coatings are controversial. Research is ongoing, but nanoparticle safety is not 100% guaranteed. Because there are other alternatives in non-toxic air fryers, Better Goods recommends that you reject any air fryer containing nanoparticle coatings.