What is atmospheric pollution?

I - Atmospheric pollution occurs when natural components of the atmosphere are altered in a local or global way, negatively affecting the ecological balance, living conditions, or the appearance of new pollutants.
II - Primary pollutants are directly emitted by a source, such as aerosols, SO2, NOX, hydrocarbons, carbon monoxide, and other less frequent pollutants.
III - Secondary pollutants are formed by the reaction of primary pollutants with natural components of the atmosphere, such as ozone, aldehydes, ketones, acids, hydrogen peroxide, free radicals, and others of diverse origin such as sulfates and nitrates.
IV - Carbon dioxide (CO2) is a toxic gas that is present in the atmosphere in small concentrations and should not be considered a pollutant, as it is converted into oxygen by photosynthesis.
a) Only I and II are correct.
b) Only II and III are correct.
c) Only III and IV are correct.
d) Only I, II, and III are correct.
e) All statements are correct.