The size distribution of particles emitted from coal-fired power plants is bimod

Question

The size distribution of particles emitted from coal-fired power plants is bimodal. What are some of the properties of the smaller fraction in terms of potential environmental implications? Of the following, which of the statements is untrue regarding particles in the atmosphere (explain)? Dispersion aerosol particles formed by grinding up bulk matter are typically relatively large. Very small particles tend to be acidic and often originate from gases. Al, Fe, Ca, and Si in particles often come from sod erosion. Carcinogenic polycyclic aromatic hydrocarbons may be synthesized from saturated hydrocarbons under oxygen-deficient conditions. Larger particles are more harmful because they contain more matter. Of the following, the species that is least likely to be a constituent of solid or liquid atmospheric particulate matter is (explain) C, O_3, H_2SO_4, NaCl, or benzo(a)pyrene. Of the following, which one is not a characteristic of dispersion aerosols (explain)? They are most readily carried into the alveoli of lungs. They are usually above 1 mu m in size. They are relatively easier to remove. They are generally less respirable. They are produced when bulk materials (larger particles) are ground up or subdivided. Match the constituent of particulate matter from the left with its most likely source from the right: Si Natural sources, soil erosion PAH Incomplete combustion of hydrocarbons SO^4^2- Element largely introduced by human activities Pb Reaction of a gas in the atmosphere

Explanation / Answer

(15)

Untrue statement is:

Large particle are more harmful.

Atmospheric particles may damage materials,reduce visiblity and cause undesirable asthetic effects.Very small particles have a particular high potential for harm,including adverse health effect.

Small particle tend to be acidic and originate from gases.So small particles are harmful.

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