There isn't a SI unit particularly for this. It would just be expressed as so many parts per million, or sometimes chemists use mg/kg which would be the same thing, or mg/liter if dealing with liquids. The standard for measuring any quantity of atoms or molecules is the mole. It is not uncommon to see "linear ozone density" expressed in Dobson units, based on characteristic absorption on a path. Along the lines of the Beer Lambert law...
Ozone concentration is measured in parts per million. It is 2-8 ppm in ozone layer.
Ozone layer is present in the stratosphere. It's concentration is measured in ppm.
An acre is over 43 thousand square feet in area. It is a unit of measure that was created to measure land.
Use temperature measurements to measure heat (i.e. Fahrenheit and Celcius)
Cloud cover is usually given as a percentage, there is no unit of measure.
Traditionally the unit is the fathom (=6 feet) but nowadays you will see metres or indeed any proper unit of length.
The ozone layer blocks ultraviolet radiation.
The dobson unit is a measure of of ozone concentration. It is the de facto for measuring it.
Ozone depletion is not worse in cities. If you measure the effects of ozone depletion by the number of people affected, there are more people per unit area in cities. Ozone depletion affects every unit area more-or-less equally. Ozone pollution affects cities worst, since NOx is mostly produced by urban and suburban<->urban traffic.
Atmospheric ozone concentration is measured in parts per million.
The correct spelling is "concentration."
j19724
The acceptable ozone is 300 to 50 Dobson unit. It is present in the stratosphere.
Ozone depletion can be controlled by curbing CFC's. They are the main reasons behind ozone depletion.
There are various measures to control ozone depletion. Curbing CFC's is one of them.
As far as I am aware, CO is not a unit of measure.
The unit used for measure temperature is the kelvin
Which unit of measure matches RAM
A unit can be a measure of length. It is one-dimensional. A squared unit can be a measure of area. It is two-dimensional. A cubic unit can be a measure of volume. It is three-dimensional.