Environment

The Room/Environment meter is often overlooked, and is a combined rating that analyzes the design and content of the room that the Sim is currently standing in. Different factors can affect this motive; for example, Sims don't like small rooms, or rooms with not enough light or windows, nor do they like dead fish in the aquarium, dead plants, walls with no texture on them, foundations will no floor texture on them, dirty plates, puddles or ash piles, or dirty or broken objects. Certain purchases will improve the room rating, such as expensive fireplaces, sculptures, landscaping, or paintings.

The Sims
This meter is known as Room in The Sims, and all Sims have it.

The Sims 2
In The Sims 2, it is renamed Environment, and does not appear until a Sim becomes a teen.

An alarm clock waking a Sim will make their environment bar completely red, until they turn it off. If they can't, their mood will drastically decrease, but it quickly recovers once they finally turn it off. An accident or fire causing Sims to panic will also drain all of their environment bar.

If there are too many plates of spoiled food around a Sim, and a Sim's environment bar is low, he or she may die by flies.

The Sims 3
In The Sims 3, the environment bar has been replaced by moodlets.