Measured clean-air bedrooms for smog-season homes, with filter swaps on schedule
TL;DR Smogward is a winter clean-air service for homes in smog-prone cities. A technician measures particles room by room, fixes the leaks, sizes and installs purifiers, then swaps filters on a schedule and sends monthly readings. Families pay a season fee, and the pitch is a number on a meter, not a health promise.
Air pollution was linked to 1.67 million deaths in India in 2019, 17.8% of all deaths that year[1]. Most people spend winter nights indoors and assume the bedroom is safer. Is it? Often not by much. A year of monitoring in Jodhpur homes found average indoor PM2.5 between 38 and 111 µg/m³, higher in every area during winter, and the worst readings tracked poor housing condition and ventilation[2].
Families buy a purifier and stop there. A lot of them buy the wrong size for the room, run it with the windows leaking and forget the filter until it's grey. Nobody checks whether the bedroom air actually improved.
Smogward sells a measured result for the rooms that matter most, usually the bedrooms of a child, an older parent or someone with asthma.
The first visit is an audit. A technician logs particle readings in each room and outside, finds the gaps around windows and doors, and checks whether existing purifiers are big enough for the room. The fix is plain - draught strips, a correctly sized purifier per room (bought through Smogward or already owned), and placement and run-time advice. A small sensor stays in each treated room.
Through the season, the family gets a monthly one-page report showing indoor against outdoor readings, and a technician swaps filters before they clog. If a room drifts above an agreed level for several days, someone visits.
I kept the claims narrow on purpose. A 2026 meta-analysis of 27 trials found purifiers and masks cut indoor particles sharply but showed no clear gain in lung function, symptoms or blood pressure[3]. Smogward promises cleaner air, measured, and leaves health claims to doctors.
The user is often an older parent or a young child, but the payer is the earning adult in the household, usually in a gated society. They already spend on devices - one leading brand alone lists seven current purifier models in India, covering rooms from 30 m² to 109 m²[4]. The likely price is a one-time audit and fit, plus a winter season plan for filters, visits and reports. Exact willingness to pay is untested.
India's purifier market was put at US$579.06 million in 2025 (about ₹5,600 Cr), growing about 13.5% a year to 2034[5]. Home sensors are cheap and reliable enough to leave in a room. And families now read AQI daily - in the Jodhpur study, awareness of the index rose from 16.67% to 100% once homes were monitored[2].
No public figure exists for a home clean-air service in India. The adjacent number is device sales, where one market-research firm puts residential use at 65% of India's US$579.06 million purifier market in 2025[5]. That tells you families already spend on hardware. Whether they will pay for measurement and upkeep on top is the thing to prove.
One Indian maker sells indoor and outdoor monitors, a data platform and a free AQI app, with a focus on building and construction-site compliance, and its site lists no home audit or purifier service[6]. Purifier brands sell purifiers through retail and leave upkeep to the owner[4]. The gap is a service that owns the outcome in a specific room for a whole season.
| Difficulty | Moderate (36/100) |
| Starting capital | ₹45–80 L |
| Time to launch | 3–5 months |
The technology is off-the-shelf. The difficulty is seasonal demand, because most revenue lands between October and February, so technicians sit idle for half the year unless you find summer work such as dust or humidity checks. Selling a service to people who already own a purifier takes clear before-and-after readings.
No special licence to run a clean-air service, as long as you sell measured air and not health outcomes.
Building this outside India? The categories above usually have a local equivalent, so check with your own regulator.
Don't let AI give health advice or tell a family their child's asthma will improve. The service measures air, and health questions go to a doctor.
Want to work out the AI layer for Smogward? Talk to Yash →
Here's what can go south -
I like this for an operator who enjoys field service and can sell inside gated societies in Delhi NCR or other smog-season cities. If you're hoping to build a device brand then it's a poor fit. First prove that 30 households who already own a purifier will pay for an audit and a season plan, and that their bedrooms stay below the agreed level.
Plan for roughly ₹45–80 L, mostly on technicians, sensors and getting through the first smog season.
No special licence. You need company registration, GST, DPDP consent for room data, and you must avoid health claims the evidence doesn't support.
Yes, in any city with a bad pollution or wildfire season. Check local rules on health claims and data protection before you sell.
The free Smogward validation kit has the line-by-line capital breakdown, the effort scoring, the rules and permissions checklist, a 14-day validation sprint with pass/fail targets, a 90-day launch plan, 10 interview questions for households and housing societies, and 5 assumptions to test. Download the kit →
Thinking about building Smogward or something close to it? The hard part is turning a five-month season into a year-round business without overpromising on health, and I'd be glad to think that through with you. If you need a hand, you know where to find me. Talk to Yash →
For illustration only. Names are fictional and ideas hypothetical; sourced facts are real but may be out of date. Nothing here is legal, financial or professional advice, and Yash Khatri is not personally liable for any use of it. Read the full disclaimer.