Oxygen is not considered a major air pollutant because it is a naturally occurring component of the Earth's atmosphere and is essential for life.

Motor vehicles are the primary source of carbon monoxide in urban areas due to the incomplete combustion of fuel in their engines.

Sulfur dioxide is primarily responsible for acid rain because it reacts with water vapor in the atmosphere to form sulfuric acid, which contributes to the acidity of rain.

Exposure to particulate matter (PM) has been linked to a range of health effects, including asthma, cardiovascular disease, and cancer.

Volatile Organic Compounds (VOCs) react with nitrogen oxides in the presence of sunlight to form ground-level ozone.

Deposition is the process by which air pollutants are removed from the atmosphere and deposited onto surfaces such as the ground, water, or vegetation.

Allowing more industrial emissions would worsen air quality, not improve it.

Air quality index (AQI) is a measure of the concentration of air pollutants in the air.

Ozone is a major component of smog, which is a mixture of air pollutants that can cause respiratory problems and other health issues.

Advection is the process by which air pollutants are transported from one place to another by the wind.

Exposure to nitrogen dioxide (NO2) has been linked to asthma, cardiovascular disease, and eye irritation, but not cancer.

Dilution is the process by which air pollutants are diluted in the atmosphere, reducing their concentration.

Sulfur dioxide is primarily responsible for the formation of acid rain because it reacts with water vapor in the atmosphere to form sulfuric acid, which contributes to the acidity of rain.

Deposition is the process by which air pollutants are removed from the atmosphere and deposited onto surfaces such as the ground, water, or vegetation.

Allowing more industrial emissions would worsen air quality, not improve it.