diff --git a/pages/audio.noise.pollution.md b/pages/audio.noise.pollution.md
index aa70dbc..ec2573f 100644
--- a/pages/audio.noise.pollution.md
+++ b/pages/audio.noise.pollution.md
@@ -21,6 +21,7 @@ https://www.sciencedirect.com/topics/earth-and-planetary-sciences/noise-emission
 - https://gemmo.ai/ai-noise-pollution/
 - https://www.smartcitiesworld.net/news/news/belgian-city-uses-artificial-intelligence-to-tackle-noise-pollution-7243
 - https://www.researchgate.net/publication/366764742_Profiling_of_Urban_Noise_Using_Artificial_Intelligence
+- https://phys.org/news/2019-03-artificial-intelligence-citizen-perception-events.html
 
 ### Others
 https://www.nonoise.org/