The evidence
Each criterion with what we found, where we found it and when. Anything we could not confirm says so.
NTH criteria
NTH Framework v1.2. Score 71.2 (raw 53.8 of 100), calibrated so the best hotel in this edition (Santa Monica Proper Hotel) reads 90. Evidence retrieved 2026-10-22.
Sleep16.0 / 24
The room as an instrument for deep, uninterrupted, circadian-aligned rest.
Mattress & sleep system
Hotel-reported · in the best room
Proprietary natural-material mattresses, free of metal springs, in every room; Eight Sleep in The Sleep Lab.
Bedding & textiles
Not yet reviewed · in the best room
Unknown. We have asked the hotel.
0.0 / 4 pts
Unknown
Sleep programme & pillow menu
Hotel-reported · in the best room
The Sleep Lab, created with sleep scientist Dr Matthew Walker.
Blackout
Hotel-reported · in the best room
Full blackout shades in every room.
Circadian & warm evening lighting
Hotel-reported · in the best room
Personalised sleep and wake automation: temperature, lighting and sound (Sleep Lab).
In-room red light
Not yet reviewed · in the best room
Unknown. We have asked the hotel.
0.0 / 2 pts
Unknown
Acoustic quiet
Hotel-reported · in the best room
Total soundproofing; high-grade STC rating.
EMF & Wi-Fi-off options
Not yet reviewed · in the best room
Unknown. We have asked the hotel.
0.0 / 2 pts
Unknown
Air5.0 / 12
What you breathe for eight hours a night: filtered, fresh, smoke-free and unperfumed.
In-room purification
Hotel-reported · in the best room
Purified air in Premier King rooms, the category fitted with The Sleep Lab.
Ventilation & building standard
Not yet reviewed · across the property
Unknown. We have asked the hotel.
0.0 / 3 pts
Unknown
Smoke-free policy
Not yet reviewed · across the property
Unknown. We have asked the hotel.
0.0 / 2 pts
Unknown
Fragrance-free & low-allergen rooms
Not yet reviewed · in the best room
Unknown. We have asked the hotel.
0.0 / 2 pts
Unknown
Water2.0 / 12
Clean water to drink, and to shower and bathe in.
Filtered drinking water
Not yet reviewed · in the best room
Unknown. We have asked the hotel.
0.0 / 5 pts
Unknown
Shower & bath filtration
Not yet reviewed · in the best room
Unknown. We have asked the hotel.
0.0 / 5 pts
Unknown
Gentler pool & hydrotherapy water
Hotel-reported · across the property
Indoor saltwater lap pool.
Nourishment6.0 / 10
Food and drink that heal rather than merely please.
Organic & local sourcing
Hotel-reported · across the property
Fresh, seasonal American menu at Electric Lemon.
Clean-ingredient standard
Hotel-reported · across the property
Nutrition-led positioning; nutrient-dense spa menu.
Clean minibar & in-room hydration
Hotel-reported · in the best room
RoomBar: 80+ performance products instead of a standard minibar.
Nutrition guidance
Not yet reviewed · across the property
Unknown. We have asked the hotel.
0.0 / 1 pts
Unknown
Movement6.8 / 10
The means to train, stretch and move, indoors and out.
Gym completeness
Hotel-reported · across the property
60,000 sq ft Equinox club included.
Classes & studios
Hotel-reported · across the property
Club class programme not re-confirmed on a hotel page.
Swimming
Hotel-reported · across the property
Indoor saltwater lap pool, rooftop pool.
Outdoor activity
Not yet reviewed · across the property
Unknown. We have asked the hotel.
0.0 / 2 pts
Unknown
Holistic Wellness14.0 / 19
Healing traditions and the recovery technology that complements them.
Spa facility
Hotel-reported · across the property
The Spa with circuit treatments; barrel saunas. Room count not published.
Traditional & integrative modalities
Hotel-reported · across the property
Acupuncture, craniosacral therapy.
Mind & breath
Hotel-reported · across the property
Breathwork, circadian colour meditation, quantum harmonics.
Heat therapy
Hotel-reported · across the property
Infrared sauna, MLX i3Dome, barrel saunas.
Cold therapy
Hotel-reported · across the property
Cryotherapy; contrast steam-and-ice shower (Sleep Lab).
Photobiomodulation & PEMF
Not yet reviewed · across the property
Unknown. We have asked the hotel.
0.0 / 2 pts
Unknown
Clinical longevity (IV, HBOT, diagnostics)
Hotel-reported · across the property
NutriDrip / Clean Market IV lounge; antioxidant scanner.
Materials & Setting4.0 / 13
What touches the skin and surrounds the stay: finishes, products, cleaning, and the landscape beyond the door.
Natural, low-VOC finishes
Not yet reviewed · in the best room
Unknown. We have asked the hotel.
0.0 / 3 pts
Unknown
Clean bath & body amenities
Hotel-reported · in the best room
Grown Alchemist body cleansers with herbs from the High Line.
Non-toxic spa & nail products
Not yet reviewed · across the property
Unknown. We have asked the hotel.
0.0 / 2 pts
Unknown
Non-toxic housekeeping & plastic-free operations
Not yet reviewed · across the property
Unknown. We have asked the hotel.
0.0 / 2 pts
Unknown
Green & blue space
Hotel-reported · across the property
Beside the High Line.
Walkability & low-impact mobility
Not yet reviewed · across the property
Unknown. We have asked the hotel.
0.0 / 2 pts
Unknown
Our review
At a glance
- Fragrance
- 5 not yet reviewed
- Air
- 5 not yet reviewed
- Cleaning & care
- 4 not yet reviewed
- Sleep & materials
- 5 not yet reviewed
- Water & pools
- 1 hotel-reported, 3 not yet reviewed
- Food
- 2 not yet reviewed
- Light & quiet
- 1 hotel-reported, 1 not yet reviewed
- Building
- 3 not yet reviewed
One reported by the hotel; the rest not yet reviewed.
1 hotel-reported24 of 25 not yet reviewed
Counts cover the 25 scored criteria; the other 5 windows are context.
Checked
Read the full profileThe ledger
Fragrance
Added scent is the most common complaint from sensitive guests, and the hardest thing to see on a booking page.
No added fragrance in rooms
Not yet reviewed.
No scent marketing
Not yet reviewed.
Fragrance-free laundry
Not yet reviewed.
Unscented bath products
Not yet reviewed.
So far, the hotel says: The Grown Alchemist bath products include botanical actives such as ‘sage essential oil, geranium oil, orange flower water, and rosemary’.
Our note. The standard products are scented. Whether an unscented option is offered on request is not stated.
How we know
What we look for. Fragrance-free toiletries in the room by default, or on request.
Why it matters. Fragrance ingredients are among the most frequent causes of allergic contact reactions to cosmetics. An unscented option lets sensitive guests use what is provided instead of packing their own.
Source: EU Scientific Committee on Consumer Safety, Opinion on fragrance allergens in cosmetic products ()
Source 1: Hotel website: in-room amenitiesUndated · read 22 Oct 2026
Unscented spa options
Not yet reviewed.
Know something about fragrance here that we don’t? Tell us
Air
What you breathe for eight hours a night: smoke history, fresh air, filtration and anything burning in the room.
Smoke-free property
Not yet reviewed.
Opening windows
Not yet reviewed.
Filtered fresh air
Not yet reviewed.
In-room air purifier
Not yet reviewed.
So far, the hotel says: ‘The room also features medical grade air filtration’, and Premier King rooms are described with ‘purified air’.
Our note. The type of filter is not named, and whether any unit ionizes or emits ozone is not stated, so this falls short of the criterion.
How we know
What we look for. A true-HEPA purifier in the room or on request, with no ozone-generating or ionizing function.
Why it matters. Portable HEPA units lower indoor particle levels, which matters most during wildfire smoke. Ionizers and ozone purifiers can add an irritant gas instead.
Sources: US EPA, Guide to air cleaners in the home (undated); US EPA, Ozone generators that are sold as air cleaners ()
Source 2: Hotel website: FAQUndated · read 22 Oct 2026
No in-room combustion
Not yet reviewed.
So far, the hotel says: ‘Open flame candles’ are not permitted on the property.
Our note. The rooms page says the Equinox Penthouse Suite has an in-bedroom fireplace whose fuel is not stated, and incense is not mentioned.
How we know
What we look for. No gas fireplaces, candles or incense in guest rooms.
Why it matters. In homes with gas appliances, the US EPA notes that indoor nitrogen dioxide often exceeds outdoor levels, and that it irritates the eyes, nose, throat and airways. Candles and incense burn in the same small, closed room.
Source: US EPA, Nitrogen dioxide’s impact on indoor air quality ()
Source 2: Hotel website: FAQUndated · read 22 Oct 2026
Know something about air here that we don’t? Tell us
Cleaning & care
How a room is cleaned, treated and prepared, and whether a request for a gentler clean is actually honored.
Low-chemical housekeeping
Not yet reviewed.
No ozone or biocide treatments
Not yet reviewed.
Low-chemical pest control
Not yet reviewed.
Sensitive-guest preparation
Not yet reviewed.
Know something about cleaning & care here that we don’t? Tell us
Sleep & materials
The textiles, mattress and floor you spend the night closest to, and how allergen-aware the room is.
Tested or organic bed linen
Not yet reviewed.
So far, the hotel says: Beds are ‘layered with temperature-regulating natural fibers’.
Our note. No certification is named, so this falls short of the criterion.
How we know
What we look for. Sheets and towels certified to a residue-testing standard such as OEKO-TEX Standard 100, or certified organic.
Why it matters. Certifications such as OEKO-TEX Standard 100 test the finished fabric, down to the thread, against a list of restricted substances, which lowers skin exposure over a night’s sleep.
Source: OEKO-TEX, OEKO-TEX Standard 100 (undated)
Source 3: Hotel website: rooms and suitesUndated · read 22 Oct 2026
Mattress materials disclosed
Not yet reviewed.
So far, the hotel says: The hotel’s mattresses are ‘handcrafted from natural materials’ and ‘free of metal springs’.
Our note. The materials are not named individually, and how the mattresses meet flammability rules is not stated, so this falls short of the criterion.
How we know
What we look for. The hotel says what its mattresses are made of and how flame-retardancy is achieved.
Why it matters. Flame retardants have been added to mattresses and seating foam, and the US National Institute of Environmental Health Sciences lists possible effects including endocrine and thyroid disruption. How much a mattress adds to anyone’s exposure is still debated; disclosure lets guests choose.
Source: US National Institute of Environmental Health Sciences, Flame retardants (undated)
Source 3: Hotel website: rooms and suitesUndated · read 22 Oct 2026
Hard floors
Not yet reviewed.
Allergy-friendly rooms
Not yet reviewed.
Pet-free rooms
Not yet reviewed.
So far, the hotel says: ‘Pets up to 25 pounds are welcome at our hotel’, with a $250 cleaning fee per room.
Our note. Whether any rooms are kept pet-free is not stated.
How we know
What we look for. Rooms or floors where animals are never allowed, cleaned to a separate routine.
Why it matters. Pet allergen can stay on carpets and furniture for months and travels on clothing. For allergic guests a room animals never enter matters more than any amenity.
Source: US National Institute of Environmental Health Sciences, Pet allergens (undated)
Source 2: Hotel website: FAQUndated · read 22 Oct 2026
Know something about sleep & materials here that we don’t? Tell us
Water & pools
Drinking water, shower water and pool air.
Filtered or tested drinking water
Not yet reviewed.
Water safety plan
Not yet reviewed.
Shower filters
Not yet reviewed.
Shown for information; not scored.
Outdoor or low-chloramine pools
Hotel-reportedonly some rooms or areas
The hotel says: The club has ‘an indoor saltwater lap pool and an outdoor pool and sundeck’.
Our note. This covers the outdoor pool. For the indoor saltwater lap pool, ask how the air is ventilated.
Shown for information; not scored.
How we know
What we look for. Pools are outdoors, or indoor pools have dedicated ventilation and monitored combined chlorine.
Why it matters. Chloramines irritate the skin, eyes and airways, and they build up in the air of indoor pools without enough ventilation. Outdoor pools, and good ventilation for indoor ones, keep levels low.
Source: US CDC, Chloramines and pool operation ()
Source 2: Hotel website: FAQUndated · read 22 Oct 2026
Context, not scored: almost every pool in this catalog is outdoors, so it says little about one hotel against another.
Know something about water & pools here that we don’t? Tell us
Food
Allergen care first; where the produce comes from second.
Allergen-aware kitchen
Not yet reviewed.
Garden or organic produce
Not yet reviewed.
So far, the hotel says: Electric Lemon ‘celebrat[es] the farmers, growers, and artisans of the Mid-Atlantic’ with local, seasonal ingredients.
Our note. Local sourcing is described, but no garden and no organic commitment.
Shown for information; not scored.
How we know
What we look for. A meaningful share of the kitchen’s produce is grown on site or certified organic.
Why it matters. A large review found detectable pesticide residues about four times as often in conventional crops as in organic ones. Over a short stay the difference in exposure is small, so we show this as a note on the kitchen, not a scored health factor.
Source: Barański et al., British Journal of Nutrition, Higher antioxidant and lower cadmium concentrations and lower incidence of pesticide residues in organically grown crops: a systematic literature review and meta-analyses ()
Source 4: Hotel website: restaurants and barsUndated · read 22 Oct 2026
Kitchen note, not scored.
Know something about food here that we don’t? Tell us
Light & quiet
Darkness and silence at night, and radio-quiet options for guests who want them.
Darkness and quiet
Hotel-reportedacross the property
The hotel says: Every room has ‘total soundproofing, next-generation blackout blinds’, and a ‘high-grade STC (Sound Transmission Classification)’.
How we know
What we look for. Blackout shades and sound insulation that let the room become properly dark and quiet.
Why it matters. Night-time noise fragments sleep; the WHO’s night noise guidelines set a target of 40 dB outside the bedroom. A dark, quiet room is the simplest sleep aid there is.
Source: WHO Regional Office for Europe, Night noise guidelines for Europe ()
Source 3: Hotel website: rooms and suitesUndated · read 22 Oct 2026
Radio-quiet options
Not yet reviewed.
Shown for information; not scored.
Know something about light & quiet here that we don’t? Tell us
Building
The materials a hotel was built and renovated with, how it handles damp, and what third parties have certified.
Low-emitting materials
Not yet reviewed.
Leak and mold response
Not yet reviewed.
Building certification
Not yet reviewed.
Shown for information; not scored.
Know something about building here that we don’t? Tell us
Notes & sources
- Hotel website: in-room amenities, Undated · read 22 Oct 2026
- Hotel website: FAQ, Undated · read 22 Oct 2026
- Hotel website: rooms and suites, Undated · read 22 Oct 2026
- Hotel website: restaurants and bars, Undated · read 22 Oct 2026
- Hotel website: The Sleep Lab, Undated · read 22 Oct 2026
- Hotel website: spa, Undated · read 22 Oct 2026
- Wikipedia: 35 Hudson Yards, Undated · read 22 Oct 2026
Room count: Per the hotel’s FAQ: 212 rooms, 48 of them suites. Hotel website (opens the hotel’s website)
Photographs: Equinox Hotel New York; Equinox Hotel New York; Equinox Hotel New York; Equinox Hotel New York; Equinox Hotel New York; Equinox Hotel New York
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