Station check
Does each station agree with satellite-based estimates?
We compare every eligible station's monthly PM2.5 with the range expected from satellite-based estimates for its location. A station gets a verdict only when 8 or more of its last 12 checked months fall on one side of that range. It describes the numbers, not anyone's intent.
By state
Alphabetical, not a rankingAgreesReads lowerReads higherNearby stations onlyNo comparison
Stations with a verdict other than "agrees"
- DTU, DelhiDelhiReads lower
- Maninagar, AhmedabadGujaratReads lower
- BTM Layout, BengaluruKarnatakaReads lower
- GM Office, BrajrajnagarOdishaReads lower
- Ardhali Bazar, VaranasiUttar PradeshReads lower
- Sanjay Palace, AgraUttar PradeshReads lower
Each page shows the months behind the verdict and the reasons a station can differ. Questions about a station: hello@abhijitvaidya.in.
How the check works
- For each station with 4 or more good years between 2016 and 2019, we learn how its monthly PM2.5 normally relates to the satellite estimate for its 1 km square.
- From that baseline we draw an 80% range for every later month.
- A verdict needs 8 of the last 12 checked months above or below the range. On held-out years this rule raised a false alarm for 1 to 2% of stations.
- Newer stations are compared with checked stations 25 to 50 km away, with no verdict.
Every checked station
StationStateVerdictIn rangeBelowAbove
Months are the last 12 checked months up to December 2024. "Nearby only" stations have a range borrowed from checked stations 25 to 50 km away and no verdict.