Odors. They are everywhere. When pleasant, we might call them “scents.” When not-so-pleasant, we might call them malodors.
Odors are caused by a variety of sources. Some odors are pleasant, welcoming, such as from a fresh-cut batch of flowers or a nice, home-cooked meal. Others are not pleasant, “malodorous,” such as from an unattended cat litter box or rotting garbage left too long in a trash bin.