Lecture 12 Review Questions and Answers (air pollution) Flashcards Preview

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Flashcards in Lecture 12 Review Questions and Answers (air pollution) Deck (15)
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1
Q

How is ground level ozone created? why is it called a secondary pollutant (know the difference)

A

Chemical reactions between Nitrogen oxide and VOCs in the presence of heat and sunlight occur at the ground level to create ground level ozone
Primary pollutant: harmful substance that is emitted directly into the atmosphere
Secondary pollutant: when primary air pollutant reacts with substances in the atmosphere to form harmful substances

2
Q

What are primary sources of VOCs?

A

Paints, paint strippers and car exhaust

3
Q

What is particulate matter? where does it come from?

A

small particles of dust, ash, soot or any other visible material

4
Q

What size of particulate matter is the most threatening to human health?

A

PM10: particles less than 10 microns in diameter

PM 2.5: particles less than 2.5 microns in diameter

The smaller particles are more dangerous because they can be inhaled and reach the lung (bigger ones get trapped in mucous)

5
Q

Environmental concern around sulfur dioxide and nitric acid?

A

Both released into atomosphere and combine with water to form acid rain. Acid rain kills plant life, pollutes rivers and stream and erode stonework. Plants cannot absorb nutrients properly from acidic soil, fish and amphibians have specific pH ranges they can tolerate.

6
Q

what is the evidence that air pollutants have an effect on human health?

A

Harvard six cities study: looked at long term health outcomes analyzed in relation to city-specific air pollution controlling for confounding variables like smoking, income, race and occupation. Found that as particle concentration increased, there was an almost directly increase in death rates. Increased mortality for cities with high long-term PM concentrations.

7
Q

what are challenges to studying air pollution effect on human health?

A

Hard to show direct dose-response relationship

Pollutants tend to co-vary and so it is hard to distinguish effects

You can demonstrate association between O and E, but not cause and effect

Must control for confounding factors

exposure assessment is ecologic

8
Q

know the two primary designs of epi studies to investigate air pollution effects

A

Time series of acute effects

Cohort and cross-sectional studies of chronic effects (harvard 6 cities)

9
Q

What are some commonly used biomass fuels?

A

Agric waste, wood, cow dug and seaweed, dried leaf, hay

10
Q

Where is traditional biomass typically used around the world?

A

Africa, india, South Asia

11
Q

Why is biomass a low efficiency energy system?

A

poor conversion of fuel energy to heat

poor transfer of heat to pot due to poor insulation and lack of contact of hot gases with pot

12
Q

How is biomass combustion harmful to human health?

A

creates large volumes of shitty products due to incomplete combustion

13
Q

two populations affected?

A

Women: COPD, cancer, blindness and heart disease
Kids: Pneumonia, Asthma, low birth weight, cognitive impairment

14
Q

2 mipediments to fixing this problem

A

under recording, lots of data from high exposure to smoke from smokers, lots of data from air pollution study, no data in the middle

15
Q

possible solutions to mitgate

A

Switch to cleaner stove with clean fuel, have chimneys. Trade off between cheap stove with modest exposure reduction and expensive stoves with large reduction