Ozone is classified as a secondary pollutant. identify the primary pollutants necessary for its formation and describe how tropospheric ozone is formed.

Ozone is formed from precursors such as volatile organic compounds (such as methane), nitrogen oxide, and carbon dioxide. These are produced more by anthropogenic activities. When these compounds react in the atmosphere through the energy from sunlight, they form ozone. One of the reactions that form tropospheric ozone is;

CO + 2O2 + hν → CO2 + O3

not sure if this is what you'r looking for nnew= nold

the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.