Question

Which answer below lists the two main sources of air pollution in urban areas? vehicles and industries vehicles and volcanoes agriculture and vehicles industries and agriculture?

Answer 1

The first one; vehicles and industries.
Vehicles, obviously, can produce harmful amounts of chemicals that can seep into the atmosphere, and industries is a term that relates to factories and fuel burning buildings, which cause even higher amounts of damage. Plus, both are concepts seen in mostly urban areas. Agriculture is actually quite helpful to the environment, unless dangerously high amounts of pesticides are used, and volcanoes are nowhere near urban areas.