City Pulse
19 of the 21 stations are reporting now · page loaded 3:55 PM IST, 15 Sep · median AQI 157 across those 19 · worst first
CACHED means we are still holding an earlier reading for that place rather than showing one that just arrived, and the tag says how old the measurement is. NO READING means we hold nothing for it — no figure is shown, because we do not have one and will not invent one. PART means that station measured only part of what goes into the number, so its figure is not directly comparable with the others. Open the station to see what it did measure.
A reading we are still holding from earlier, shown with its age — not the air right now. We hold nothing for this station, so no figure is shown — none is invented. Worked out from only part of what goes into the number, so not directly comparable with the other stations.
No readings stored for Okhla yet — every live reading is indexed as it arrives, so this fills in as the feed answers.
The figure in the header is the latest single reading we can show; this curve is drawn only from stored history, so a number can sit above an empty chart until that history builds.