Which is most likely a source of air pollution?

Air pollution can originate from various sources, and the most likely sources include:

1. Industrial Emissions: Factories and power plants release pollutants such as sulfur dioxide, nitrogen oxides, and particulate matter into the air.

2. Vehicle Exhaust: Cars, trucks, and buses emit carbon monoxide, nitrogen oxides, and hydrocarbons, contributing significantly to urban air pollution.

3. Agricultural Activities: The use of fertilizers and pesticides can release ammonia and other chemicals into the atmosphere.

4. Burning of Fossil Fuels: This includes coal, oil, and natural gas used for electricity generation, heating, and transportation.

5. Deforestation and Biomass Burning: These activities release carbon dioxide and other pollutants into the air.

6. Household Activities: Use of household products, heating, and cooking can also contribute to indoor air pollution.

Final Answer

The most likely sources of air pollution are industrial emissions and vehicle exhaust.