Question

which of the following contributes the most to the reaction that produces secondary air pollution from a combination of primary pollutants?
sunlight
altitude
gravity
pressure

Explanation:

Secondary air pollutants like ozone are formed when primary pollutants (e.g., nitrogen oxides, volatile organic compounds) react in the presence of sunlight. Sunlight provides the energy for photochemical reactions that convert primary pollutants into secondary ones. Altitude, gravity, and pressure do not play the primary role in this type of reaction.

Answer:

sunlight