Question

understanding key concepts
after reading the question or statement, select the correct answer.

1. the pollutant that makes up the largest component of urban smog is

a. ozone.
b. carbon monoxide.
c. sulfur dioxide.
d. nitrogen oxides.

1. an aqi of 76 falls into the \moderate\ range. this means that the quality of the air poses

a. little or no health risk for anyone.
b. a moderate concern for a very small number of people.
c. a threat to members of sensitive groups, such as those with lung disease.
d. a serious threat to everyone.

1. which of the following is not a common indoor air pollutant?

a. asbestos
b. carbon monoxide
c. ozone
d. radon

Explanation:

1. Ozone is a major component of urban smog. It is formed through chemical reactions involving nitrogen - oxides and volatile organic compounds in the presence of sunlight.
2. An AQI (Air Quality Index) in the moderate range (51 - 100) indicates that air quality poses a threat to members of sensitive groups such as those with lung disease.
3. Ozone is not a common indoor air pollutant as it is mainly formed in the atmosphere through photochemical reactions and has a short lifespan indoors. Asbestos, carbon - monoxide, and radon are common indoor pollutants.

Answer:

1. a. ozone
2. c. a threat to members of sensitive groups, such as those with lung disease.
3. c. Ozone