A Form of Coal Which Produces Less Harmful Smoke When

Q6: Air pollution problems were essentially non-existent until

Q7: Acid fog, found at high altitudes, has

Q8: The Clean Air Act generally separates air

Q9: The rapid combination of a material with

Q10: Emissions of toxic air pollutants in the

Q12: Products of burning coal in air can

Q13: Products of burning coal in air can

Q14: Secondary air pollutants are<br>A)rapidly formed<br>B)formed from primary

Q15: Coal (carbon) tends to burn to produce

Q16: Smoke is<br>A)a gas<br>B)the same as smog<br>C)very finely