High

Illustration of high air quality level

Comparison of a coastline with high vs low marsh

Illustration of high chlorophyll concentration

An illustration indicating a high concentration of dissolved organic carbon

Illustration of a high concentration of particulate organic carbon

Illustration of a high concentration of phytoplankton

Illustration of high concentration

Illustration of high ammonium concentration

Illustration of high carbon dioxide concentration

Illustration of high dissolved oxygen concentration

Illustration of high nitrate concentration

Illustration of high nitrite concentration

Illustration of high nitrogen concentration

Illustration of high nitrogen and phosphorus concentration

Illustration of high oxygen concentration

Illustration of high ozone concentration

Illustration of high phosphate concentration

Illustration of high phosphorus concentration

Illustration of high salinity concentration

Illustration of high silicate concentration

Illustration of high sulfate concentration

Illustration of high turbidity concentration

Illustration of high delta for element, x

Illustration of high del 13C delta

Illustration of high del 15N delta

Illustration of a high voltage power stanchion

Illustration of high certainty asterisk

Illustration of high uncertainty question mark

Illustration of metal halide light bulb

Illustration of storm damage effects on mangroves

Unicode: 1F6A0

Illustration of mountains with high gradient stream to sandstone lake

Illustration of mountains with river, tinajas, and marsh

Illustration of a prison tower, with fence in front and prison behind

Illustration of high primary production

Illustration of high respiration

Illustration of a metro train

Illustration of a high response (any element) in a bioassay

Illustration of high response to light in a bioassay

Illustration of a high nitrogen bioassay response