1. In general, which of the following combination of pollutants is needed for smog production?

	A. Chlorofluorocarbons (CFCs), suspended particulates (SP or PM10), nitrogen (N2), volatile organic compounds (VOCs)
	B. Nitrogen oxides (NOx), carbon monoxide (CO), nitrogen (N2), water vapour (H2O(g))
	C. Volatile organic compounds (VOCs), nitrogen oxides (NOx), carbon monoxide (CO), sulphur dioxide (SO2), water vapour (H2O(g)), suspended particulates (SP or PM10)
	D. None of the above

2. What are the primary sources of pollutants needed for smog production?

	A. Burning fossil fuels for transportation
	B. Burning fossil fuels for heating
	C. Industrial products such as paint and solvents
	D. All of the above

3. Other than pollutants themselves, what other conditions assist in smog formation?

	A. Sunlight and water vapour (humidity)
	B. Sunlight, oxygen and water vapour (humidity)
	C. Oxygen and water vapour (humidity)
	D. None of the above

4. Which of the following are considered to be the 2 key components of smog?

	A. Nitrogen oxides (NOx) and volatile organic compounds (VOCs)
	B. Ground-level ozone (O3) and particulate matter (PM)
	C. Ground-level ozone (O3) and carbon dioxide (CO2)
	D. Oxygen (O2) and water vapour (H2O(g))

5. What is needed to produce ground-level ozone?

	A. Volatile organic carbons (VOCs) plus nitrogen oxides (NOx)
	B. Volatile organic carbons (VOCs) plus nitrogen oxides (NOx) plus sunlight
	C. Hydrogen plus oxygen plus carbon
	D. Oxygen (O2) and water vapour (H2O(g))

6. Suspended particulates are made up of dangerous compounds and substances. These may include:

	A. Acid aerosols, metals, and polyaromatic hydrocarbons (PAH)
	B. Sulphates and nitrates
	C. Pollen and fine dust
	D. All of the above