(a) Figure 1-1 shows a peak O₃ concentration of 19 mPa in the stratosphere. Figure 1-3 shows a peak concentration of O₃ of 39 ppb at ground level at one particular location. To compare these concentrations, convert 39 ppb to pressure in mPa. Which concentration is higher? To convert ppb to mPa, assume that atmospheric pressure at the surface of the Earth is 1 bar ; 105 Pa. If atmospheric pressure is 1 bar, then a concentration of 1 ppb is 1029 bar. 

In Figure 1-1

In Figure 1-3

(b) The pressure of the atmosphere at 16 km altitude in the stratosphere is 9.6 kPa. The peak pressure of O₃ at this altitude in the stratosphere in Figure 1-1 is 19 mPa. Convert the pressure of 19 mPa to ppb when the atmospheric pressure is 9.6 kPa.

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30 Normal stratospheric 25 ozone 20 Ozone hole 15 10 Aug. 1995 12 Oct. 1993 5 Oct. 1995 10 15 20 Ozone partial pressure (mPa) Altitude (km)