FlightNoise24Chicago O'Hare Airport (ORD) aircraft noise map
September 2026 - Lden, the EU's day-evening-night noise level
Chicago O'Hare Airport serves Chicago, the United States. In September 2026, the aircraft noise of an average day around it reached an Lden of 55 dB or more - the lowest level the EU's noise maps report - over 322 km², and 65 dB or more over 60 km². Night flights (23-07 local time) made 40% of that noise as Lden counts it, each night flight like ten daytime ones. The 55 dB area was 10% smaller than in August 2026.
| September 2026 | August 2026 | |
|---|---|---|
| Lden 55 dB or more | 322 km² | 358 km² |
| Lden 60 dB or more | 148 km² | 152 km² |
| Lden 65 dB or more | 60 km² | 59 km² |
| Lden 70 dB or more | 20 km² | 20 km² |
| Lnight 50 dB or more | 172 km² | 195 km² |
| Night share of the noise | 40% | 43% |
How it is calculated
From the positions of the flights the OpenSky Network receives over ADS-B, with the engine thrust each part of a flight needs and the noise curves of ECAC Doc 29, the method behind the EU's official noise maps (details). The areas count the places within 35 km of the airport that are nearer to it than to any other airport with a runway of 1.5 km or more. Where OpenSky's receivers miss flights, the levels come out too low.