denser

The smog crisis is worse in winter, when cold, denser air traps pollutants closer to the ground.

He has resisted efforts to amend zoning rules for certain neighborhoods to allow for denser housing.

"Ocean acidification, driven by higher levels of carbon dioxide, affects the mineralization of shark skeletons. This makes their bones denser and heavier, reducing their buoyancy and increasing the energy they need to swim."

The most intense fires occurred in Northern California, where fire-fueling vegetation is denser than elsewhere in the state.

Their incredible density -- only black holes are smaller and denser -- is thought to squeeze protons and electrons together, fusing them into neutrons.