Calculate and compare the ozone concentration in ug/m^3 for a polluted day in Mexico City (210 ppbv ozone, 30 C, 0.77 atmospheres pressure) and the ozone concentration in the stratosphere (8 ppmv ozone at 30 km). Use the Standard Atmosphere to get pressure and temperatures for the strarosphere at 3- km. The US Standard Atmosphere is a reference temperature and pressure profile for the lower atmosphere of the Earth widely used by engineers and scientists.