Latest publication / Note 01 / White paper

Diwali night, indoors: 17 hours of PM2.5 in a sealed home

A first-generation SentioAir prototype recorded PM2.5 every 15 seconds in a closed room through Lakshmi Puja night. With windows shut, firecracker smoke halved only every 3.1 to 3.5 hours, then stalled at 81 µg/m³ until a window was opened at 9:45 AM.

Shivraj Patil9 November 202619 pages18 min readIndoor exposure
SentioAir.
Note 01 / Indoor air on Diwali night
Diwali night, indoors: 17 hours of PM2.5 in a sealed home
SentioAir Research / Pune, India

Measuring the air people actually breathe.

Open, careful, reproducible research on indoor air, low-cost sensing and air intelligence, from an Indian deep-tech lab in Pune.

This particle field is drawn from 4,112 PM2.5 readings in Note 01, our first study. Scroll to move through that night.Scroll
Latest publication / Note 01 / White paper

Diwali night, indoors: 17 hours of PM2.5 in a sealed home

A first-generation SentioAir prototype recorded PM2.5 every 15 seconds in a closed room through Lakshmi Puja night. With windows shut, firecracker smoke halved only every 3.1 to 3.5 hours, then stalled at 81 µg/m³ until a window was opened at 9:45 AM.

Shivraj Patil9 November 202619 pages18 min readIndoor exposure
SentioAir.
Note 01 / Indoor air on Diwali night
Diwali night, indoors: 17 hours of PM2.5 in a sealed home
465µg/m³
Peak PM2.5 inside a closed room, 9:51 PM
3.1 to 3.5h
Half-life of PM2.5 in the sealed room overnight
81µg/m³
Where the sealed room stalled, 6:00 to 9:45 AM
99.9%
Data coverage at 15-second resolution

Publications

White papers, technical notes and datasets. Every paper ships with its method, its limits and its data.

9 Nov 2026White paperDiwali night, indoors: 17 hours of PM2.5 in a sealed homeNote 01. Indoor PM2.5 decay, plateau and ventilation, measured at 15-second resolution.Indoor exposure→
2026Validation studyCo-location of SentioAir monitors with reference instrumentsA multi-day comparison of SentioAir units against other air quality monitors.In preparationSensing and calibration
2027Technical noteAnomaly detection at the edge on low-power air monitorsOn-device models that flag unusual air events without the cloud.In preparationAir intelligence

Patents, on the record.

Inventions from the lab, listed with their filing status. Full details appear here once each application is published by the patent office.

LSP1154India
Title to be confirmedApplication number and abstract to be added.Placeholder
  1. Filed
  2. Published
  3. Examination
  4. Granted
LSP1155India
Title to be confirmedApplication number and abstract to be added.Placeholder
  1. Filed
  2. Published
  3. Examination
  4. Granted

Note: patent titles and statuses above are placeholders until confirmed.

Our standard

Research is only useful if people can check it. These four rules apply to everything we publish.

i.

Measure first

Claims follow data, at the resolution the question needs.

ii.

Publish the method

Every result ships with how it was produced and how to reproduce it.

iii.

State the limits

Uncertainty and limitations are reported as plainly as findings.

iv.

Validate

Low-cost measurements are checked against reference instruments.

15 s
Measurement interval on our home monitors
5
Indian cities with live pilot units
1,000+
Hours of air data collected
CPCB
Indian National AQI used for every index we report

New research, by email.

A few papers a year. No marketing.