<p>Chapter 13: Air Pollution</p><p>1) The spreading or dilution of pollutants into the atmosphere is best when winds are A) neutral B) less than 10 km/hr C) calm D) steady E) strong and variable (gusty) </p><p>5) The capacity of the atmosphere to disperse and dilute pollutant materials is A) limited and highly variable B) unlimited except in the tropics C) unlimited D) limited and very small E) large and unchanging </p><p>6) Which of the following is a natural source of pollutants not accentuated by humans? A) fire B) dust C) viruses D) bacteria E) pollens </p><p>8) Dangerous indoor air pollutants include A) radon B) formaldehyde C) cigarette smoke D) b and c E) a, b, and c </p><p>10) Meteorological conditions are important in air pollution episodes since they A) control the emission of pollutants B) are important sources of pollutants C) determine the location of sources D) determine the amount of dilution E) both c) and d) </p><p>13) Dilution or mixing of air pollutants into the surrounding air is best when A) winds are calm to light B) inversions are present C) relative humidity is high D) air is unstable E) air is very cold 15) Assume you live in an urban setting and an inversion is present. Which of these best describes the visibility in your area if the inversion remains for 2 or 3 days? A) improves slightly B) visibility gets steadily worse C) visibility improves greatly D) little or no change </p><p>16) The primary purpose of a smokestack is to A) burn off inversion layers B) promote adiabatic cooling of the smoke C) change the lapse rate D) reduce the concentration of pollutants at ground level E) both b) and d) </p><p>19) Temperature inversions are associated with: A) unstable atmospheric conditions B) a restricted mixing depth C) periods of good visibility D) effective dispersal of pollutants </p><p>24) Inversions represent a hazardous meteorological condition with respect to air pollution because they always bring A) cold temperatures B) strong winds C) turbulent motion D) a near total lack of mixing E) reduced oxygen content </p>