The record
Nothing is
overwritten.
Every reading we publish stays where we published it, with its source, its date and the limit it was judged against.
What is kept
Six subjects, six cadences, six different kinds of source.
Delhi air
Hourly · CPCB CAAQMS, mirrored on data.gov.in
315 hourly observations, from 25 Aug 2026.
Judged against: PM2.5 24-hour: 60 µg/m³ (NAAQS 2009)
The Yamuna
Annual · CPCB National Water Quality Monitoring Programme
Published once a year as a station table. The whole series is on the live page.
Judged against: DO > 5.0 mg/L, BOD < 3.0 mg/L (PWQC 1986)
Heat
Seasonal · ERA5 reanalysis, fourteen stations
Thirty-five years per station.
Judged against: IMD heatwave criteria — a definition, not a standard
Forest loss
Annual · FSI ISFR and Hansen / GFW
Both kept side by side. Reconciling them into one number would be the error.
Judged against: No limit — two definitions that disagree
Fire
Annual sample · NASA FIRMS, VIIRS S-NPP
One fixed ten-day March window each year, so the series is comparable by construction.
Judged against: No limit published anywhere
Extreme rain
Seasonal · ERA5, with NCRB for the deaths
Days over the heavy-rain threshold per station, and the deaths recorded against five named causes.
Judged against: IMD day categories — severity, not permission
The one that is published day by day
Air is hourly — the only subject with enough resolution for a page per month.
315 hourly observations of Delhi's air are kept, from 25 Aug 2026 to 15 Sep 2026, each with the worst reporting monitor named and the full state of the network at that hour.
Cite it, reuse it
Everything here is published under CC BY 4.0. Quote a figure, republish a table, build something on it. If you quote a number, quote the kind with it — counted or modelled — and name the upstream source, which keeps its own terms.
Swechha. Environmental record.
https://swechha.in/record
Next
The live readings, the explanations, and the way in.
Once a month, what these numbers did.
One email. What the six readings did that month, what moved and what did not, and what we did about it. Nothing else, ever — no appeals between digests, and your address is never shared with anybody.
Confirm by email before anything is stored. Every message carries a one-click link to stop them.