* not completed

. Which one(s) of the following units could apply to the air exchange rate for a building?

mg m^-3 h^-1 correct incorrect

mg h^-1 correct incorrect

m^-3 h^-1 correct incorrect

h^-1 correct incorrect

m³ h correct incorrect

* not completed

. Which of the following statements regarding atmospheric pollutants is/are true? (Please select all that apply)

Atmospheric lead is considered to be a secondary pollutant correct incorrect

For a gas in the atmosphere, a safe mixing ratio when specified for a 24 h period is always less than that for a 1 h period correct incorrect

Elevated levels of particulates and of sulfur dioxide often occur together in an urban atmosphere correct incorrect

Ozone levels provide an integrative measure of levels of hydrocarbons, carbon monoxide and nitrogen oxides in the atmosphere correct incorrect

Carbon dioxide is at least partially removed from automobile exhaust by a catalytic converter correct incorrect

* not completed

. The concentration of formaldehyde in a room (P°, 20°C) is found to be 1.2 μg m^-3. What is the mixing ratio in ppbv?

1.2 correct incorrect

0.83 correct incorrect

0.96 correct incorrect

1200 correct incorrect

6.0 correct incorrect

* not completed

. Which of the following statements regarding atmospheric pollutants is/are true? (Please select all that apply)

Some solid particulate matter in the PM_2.5 category is derived from natural sources correct incorrect

Ozone is emitted from both internal combustion engines and coal fired power plants correct incorrect

Total solid particulate levels and sulfur dioxide concentrations are often related correct incorrect

Combustion of coal and of diesel fuel are significant sources of sulfur dioxide correct incorrect

Atmospheric lead is sometimes the result of using high octane gasoline in automobiles   correct incorrect

* not completed

. Which of the following statements about air quality indices is/are true?  (Please select all that apply)

The US air quality index (AQI) is a combined average of individual AQI values correct incorrect

Air quality index values are reported on a scale of 0 to 100 correct incorrect

The Multi-Pollution Index (MPI) uses atmospheric concentrations in contrast to the AQI which uses mixing ratios correct incorrect

Large negative values of MPI indicate good quality air correct incorrect

Mixing ratio values used for the AQI are all calculated on a 24 h basis correct incorrect

* not completed

. Which of the following statements about indoor air pollutants is/are true? (Please select all that apply)

Fuel-derived nitrogen is one source for producing nitric oxide during indoor combustion correct incorrect

Polybrominated diphenyl ether compounds act as flame retardants by supplying bromine to terminate radical chain reactions correct incorrect

In urea formaldehyde foams, there can be rapid release of formaldehyde from end groups in the polymer correct incorrect

Radon is a common constituent of soils and other geological materials correct incorrect

Both cooking and tobacco smoking are sources of PAH compounds in indoor atmospheres correct incorrect

* not completed

. Which of the following statements about gases released during indoor combustion is/are true? (Please select all that apply)

Much more NO is generated when burning natural gas than when burning wood correct incorrect

Sulfur dioxide emissions are not usually a problem from indoor combustion correct incorrect

Combustion of wood emits more particulates but less VOCs than does natural gas correct incorrect

Formaldehyde is present in the gas stream from tobacco burning correct incorrect

In a building, mixing ratios of carbon dioxide that are double that of ambient air are considered to be dangerous correct incorrect

* not completed

. Which of the following statements about asbestos is/are true? (Please select all that apply)

A world-wide ban on the industrial applications of asbestos is now in effect correct incorrect

Persons living in rural areas remote from mine sites do not inhale asbestos fibres correct incorrect

In air, longer fibres are generally considered to be more dangerous to human health than shorter fibres correct incorrect

Physical, rather than chemical, analysis is the preferred method of measurement correct incorrect

Mesothelioma and liver cancer are two diseases which have been traced to asbestos correct incorrect

* not completed

. Which of the following statements regarding the major factors determining the quality of indoor air is/are true? (Please select all that apply)

A pollutant in the air outdoors around a well-sealed building will be found in the indoor air even with an extremely low air exchange rate correct incorrect

Having a high exchange rate of air in a building will eventually eliminate all pollutants correct incorrect

Newly installed carpets can increase the amount of pollutant materials in indoor air correct incorrect

Any activity conducted indoors is likely to affect the quality of the indoor air correct incorrect

Concrete used in the construction of homes does not negatively affect indoor air quality correct incorrect

* not completed

. VOCs are produced indoors at the rate of 9.5 mg m^-3 h^-1 and have indoor and outdoor concentrations of 1000 and 50 μg m^-3 respectively, determine the air exchange rate.  (Please select all that apply)

12 h^-1 correct incorrect

0.083 min^-1 correct incorrect

0.167 min^-1 correct incorrect

6.1 min correct incorrect

10 h^-1 correct incorrect