Question

Write the unit for measuring ozone thickness.

Answer 1

Hint: This unit is defined as the thickness (in units of $10\mu m$) of that pure gas layer, which at standard temperature and pressure conditions (STP) would form the total column quantity.

Complete answer:
In the stratosphere, the ozone layer is found. It serves as a shield that blocks ultraviolet radiation from the sun, measured in Dobson units (DU), 1 DU = 1 ppb, the thickness of ozone in a column of air taken from the earth to the top of the atmosphere.
Ozone is a highly reactive gas that is composed of three atoms of oxygen. It is both a natural and a man-made substance found in the upper atmosphere of the Earth. (The stratosphere) and the troposphere (lower atmosphere). Ozone impacts life on Earth in either good or bad ways, depending on where in the atmosphere it is.

Additional information: In 1913, the French physicists Charles Fabry and Henri Buisson discovered the ozone layer. Sun measurements showed that the radiation sent from its surface and reaching the ground on Earth is generally consistent with a black body's spectrum with a temperature range of $5,500 K - 6,000 K (5,227^\circ C \ to \ 5,727^\circ C)$, except that at the ultraviolet end of the spectrum there was no radiation below a wavelength of about 310 nm. It was concluded that something in the atmosphere was consuming the missing radiation. Eventually, only one recognized chemical, ozone, matched the spectrum of the missing radiation. The British meteorologist G. explored its properties in depth. A simple spectrophotometer (the Dobsonmeter) that could be used to measure stratospheric ozone from the soil was developed by M. B. Dobson. Dobson developed a worldwide network of ozone monitoring stations between 1928 and 1958, which continues to function to this day. A convenient indicator of the amount of ozone overhead, the "Dobson unit" is named in his honor.

Note: There are two distinct layers of ozone present in the Earth's atmosphere. The troposphere, the layer closest to the earth, contains "evil" ozone. Tropospheric ozone is a toxic contaminant that develops when different chemicals produced by humans are altered by sunlight.