Coyotes can hear sounds from much farther away – potentially three times farther or more depending on conditions – while human hearing drops off much sooner, especially for faint noises. It is one of their key survival tools.
An air horn is an effective and harmless means of scaring coyotes away. The 121 decibel WoodsCan Hornet air horn, which sounds extremely loud to us, would be an extremely startling sound to coyotes but in no way would harm them.