CSS Environmental Sciences Environmental Pollution and Control Syllabus

Environmental Pollution and Control syllabus — full chapter and topic list

Expand any chapter to see its topics and sub-topics. This is the whole examinable outline for Environmental Pollution and Control in CSS Environmental Sciences, not a summary of it.

1. 1

   Air Pollution

   4 topics

   • Sources and Classification of Air Pollutants
   • Effects on Health and Environment
   • Air Quality Monitoring and Standards
   • Air Pollution Control Technologies
2. 2

   Water Pollution

   4 topics

   • Sources and Types of Water Pollution
   • Eutrophication
   • Water Quality Parameters and Standards
   • Wastewater Treatment
3. 3

   Soil Pollution and Land Degradation

   4 topics

   • Soil Pollution Sources and Effects
   • Water Logging and Salinity
   • Deforestation
   • Desertification
4. 4

   Noise Pollution and Solid Waste

   3 topics

   • Noise Pollution Sources and Effects
   • Solid Waste Generation and Composition
   • Solid Waste Management Practices
5. 5

   Global and Regional Air Pollution Problems

   4 topics

   • Greenhouse Effect and Global Warming
   • Ozone Layer Depletion
   • Acid Rain
   • Photochemical Smog

Environmental Pollution and Control flashcards for CSS Environmental Sciences

18 of 50 cards from the Environmental Pollution and Control deck — real questions with worked answers.

1. What are the two broad categories of air pollutants based on their origin?

   Primary pollutants (emitted directly, e.g. SO2, NOx, CO, particulates) and secondary pollutants (formed in the atmosphere by reactions, e.g. ozone, PAN, acid rain).

2. Name the major natural sources of air pollution.

   Volcanic eruptions, forest fires, dust storms, pollen and spores, decay of organic matter (releasing methane and H2S), and sea-salt spray.

3. List the six 'criteria' air pollutants regulated under most ambient air quality standards.

   Particulate matter (PM10/PM2.5), sulfur dioxide (SO2), nitrogen dioxide (NO2), carbon monoxide (CO), ozone (O3), and lead (Pb).

4. What distinguishes PM2.5 from PM10, and why is PM2.5 more dangerous to health?

   PM2.5 are fine particles ≤2.5 micrometers; PM10 are ≤10 micrometers. PM2.5 penetrates deep into the alveoli and bloodstream, causing greater cardiovascular and respiratory harm.

5. What is a secondary pollutant? Give a classic example and its formation.

   A pollutant formed in the atmosphere from primary pollutants. Example: ground-level ozone, formed when NOx and volatile organic compounds (VOCs) react in sunlight (photochemical smog).

6. What is photochemical smog and which conditions favor it?

   A brownish haze of secondary pollutants (ozone, PAN, NO2) formed by photochemical reactions of NOx and VOCs in sunlight. Favored by intense sunlight, high traffic, and temperature inversions in cities like Lahore.

7. What causes acid rain and what is its typical pH?

   SO2 and NOx react with atmospheric water to form sulfuric and nitric acids. Acid rain has a pH below 5.6 (the natural pH of CO2-saturated rain).

8. Which air pollutant binds to hemoglobin and how does it harm the body?

   Carbon monoxide (CO) binds to hemoglobin forming carboxyhemoglobin, with ~200–250 times the affinity of oxygen, reducing oxygen delivery and causing asphyxiation.

9. What is a temperature (thermal) inversion and why does it worsen air pollution?

   When a warm air layer sits above cooler surface air, it traps pollutants near the ground by preventing vertical mixing, causing pollutant accumulation and smog episodes.

10. Which pollutants are responsible for stratospheric ozone depletion?

    Chlorofluorocarbons (CFCs), halons, carbon tetrachloride, and methyl chloroform — they release chlorine and bromine that catalytically destroy ozone.

11. What is the difference between 'good' and 'bad' ozone?

    Stratospheric ozone (good) shields Earth from UV radiation; tropospheric/ground-level ozone (bad) is a harmful pollutant and component of smog.

12. List the main greenhouse gases contributing to global warming.

    Carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), water vapor, ozone, and fluorinated gases (CFCs/HFCs).

13. What is the Air Quality Index (AQI) and what does a higher value mean?

    A numerical scale (0–500) summarizing air pollutant concentrations into health categories. Higher AQI means more polluted air and greater health risk; values above 300 are hazardous.

14. What instrument measures suspended particulate matter in ambient air?

    A High-Volume Sampler (Hi-Vol), which draws air through a filter to collect and weigh suspended particulates over a set period.

15. Name common air pollution control devices for particulate matter.

    Electrostatic precipitators (ESP), cyclone separators, fabric filters (baghouses), and wet scrubbers.

16. How does an electrostatic precipitator (ESP) remove particulates?

    It charges particles in the gas stream electrically, then collects them on oppositely charged plates; efficiency can exceed 99% for fine particles.

17. How does a wet scrubber control air pollution?

    It passes polluted gas through a liquid (usually water) spray that captures particulates and dissolves soluble gases like SO2, removing them from the gas stream.

18. What is flue-gas desulfurization (FGD) and what does it remove?

    A process that removes SO2 from flue gases, commonly by spraying limestone/lime slurry that reacts with SO2 to form gypsum (calcium sulfate).

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