Aira Home Wellness — score your unit’s health baseline
Aira Home Wellness is a free tool from Pico X Health that scores any Singapore residential unit against six structural health axes — the things about your home that don’t change with today’s weather. Enter your postal code, floor and main window facing, and Aira returns your Aira Unit Wellness Index and AMRI (Aira Mould Risk Index), plus a rotating list of personalised DIY suggestions.
What we score
- Ventilation — MSS 30-year monsoon wind climatology, façade alignment via cosine similarity, floor profile, URA wind-corridor membership and cross-ventilation multiplier.
- Sun & UV — NEA 5-year UVI climatology combined with an analytic tropical façade-incidence integral at Singapore’s latitude.
- Urban heat (UHI) — NUS Roth UHI raster sampled at the 3-digit postal centroid, with floor lapse, greenery cooling and coastal offset.
- Noise — on-demand ISO 9613-2 + UK CRTN physics against OSM roads and MRT within 300 m, with a multi-signal road classifier and an outdoor-to-indoor split.
- Outdoor air — long-run NEA regional PM2.5 baseline plus graded road-proximity penalties; live NEA PM2.5 drives the Today card separately.
- AMRI — humidity & mould — per-postal outdoor RH from 5 years of NEA hourly stations (IDW), AC offset, coastal and greenery adjustments, benchmarked against ASHRAE 160 thresholds and calibrated with Pico X Health field-service inspection data.
How Aira helps
Every score comes with a plain-English summary of your unit’s biggest strength and biggest structural weakness, plus 4–5 rotating DIY suggestions — paint colour and finish, air-purifying plants, aircon habits, cleaning cadence, weather-stripping, blackout choices, dehumidifier setpoints and more — chosen to counter your weakest axes, not generic advice.
What makes it defensible
The Aira Unit Wellness Index is built from published standards (ISO 9613-2, UK CRTN, ASHRAE 55, ASHRAE 160) and public Singapore data (NEA, MSS, OneMap, URA, OSM, NUS UHI), calibrated against a fixed 3,000-unit benchmark of real Singapore addresses and Pico X Health’s proprietary field-service data. Coefficients stay private; ingredients are named openly on the page.
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Frequently Asked Questions
- What is the Aira Unit Wellness Index?
- A 0–100 structural wellness score for a specific Singapore residential unit, computed from postal code, floor, facing and AC usage. It blends six sub-indexes — ventilation, sun & UV, urban heat, noise, outdoor air and AMRI mould risk — using long-run climatology, not today’s weather.
- What is AMRI?
- AMRI (Aira Mould Risk Index) is Aira’s proprietary indoor-RH and mould-growth risk score. It uses IDW-interpolated NEA humidity from the 3 nearest stations, a psychrometric AC offset, coastal and greenery modifiers, and ASHRAE 160 mould thresholds — calibrated against Pico X Health field-service inspection data.
- Does the score change with floor and facing?
- Yes. Two units in the same block on different floors or facings get different scores. Facing changes ventilation (cosine alignment with monsoon wind) and sun exposure (analytic façade incidence). Floor changes ventilation profile, UHI lapse, PM2.5 lift and noise elevation.
- Does today’s weather change the structural score?
- No. Structural scores use long-run baselines (MSS 30-year wind, NEA 5-year UVI, NEA 5-year hourly RH). A haze day or a heatwave changes the separate “Today” card but never the unit baseline. Two different questions, kept separate on purpose.
- What data sources do you use?
- NEA (PM2.5, PSI, hourly RH, UVI climatology, ambient temperature), MSS (monsoon wind climatology, 1991–2020 baselines), OneMap (postal geocoding), URA (wind corridors), OpenStreetMap (roads, MRT), NUS Roth UHI map, and Pico X Health proprietary field-service data.
- Is my address stored?
- Postal codes are used to look up climate baselines and cached to speed up repeat scores. No account is required to score a unit. AI suggestions are cached per unit configuration for 24 hours.
- Is this medical advice?
- No. Aira Home Wellness is a structural home-comfort and mould-risk indicator. For symptoms or diagnoses, consult a doctor. Aira never gives medical, financial or legal advice.
- How do I get personalised DIY suggestions?
- After scoring your unit, Aira uses gpt-4o-mini to pick 4–5 items from a vetted library of ~35 recommendations — filtered to counter your unit’s weakest sub-scores, rotated weekly, and always including one paint colour/finish and one plants suggestion.