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Green noise
Green noise has no standard definition. Unlike white, pink and brown noise, it is an informal name. One widely quoted description is that it is marketed by makers of ambient recordings as "the background noise of the world": similar to pink noise but with more energy around 500 Hz, like a natural outdoor setting without human-made sound. In image processing, 'green noise' means something else entirely. The version on this page follows the first description: pink noise with a gentle lift around 500 Hz.
Live in your browser
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Green noise
Our version: pink noise with a gentle peaking boost centred near 500 Hz, about one octave wide.
Generated live in your browser. Start low and raise it until the room blurs.
Pair it with the 25/5 Pomodoro timer
Green noise is soft and mid-range, a good fit for a relaxed 25/5 session or reading.
Focus
25:00
Then a 5 min break
What the evidence says
Honest summary: we found no research on green noise and focus, sleep or attention. The studies that exist are on white and pink noise (Nigg et al. 2024). If you like green noise, that is a fine reason to use it; it is a softer, mid-range alternative to pink noise.
How to use it with a timer
- Play it at a low volume; its mid-range focus makes it feel present even when quiet.
- Start the 25/5 timer.
- Compare one session with green noise and one with rain or pink noise.
Keep it quiet. According to the NIDCD, sound at or below 70 dBA is unlikely to cause hearing loss; long or repeated exposure at 85 dBA or more can (NIDCD). A good rule: you should still be able to hear someone speaking at normal volume next to you.
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About green noise. Missing something? Write to [email protected].
An informal name, not a standard one. It is usually described as pink noise with extra energy around 500 Hz, meant to resemble a quiet natural setting.
There is no research on it. Studies on noise and attention used white and pink noise. Use it if you find it pleasant.
It covers the audible range like other noise, with a lift in the middle, around 500 Hz in the common description.