7.4 Atmospheric CO2 & PM from Unit 7 Notes

7.4 Atmospheric CO2 & PM

By Georgina Kirchhof

Multiple Choice

_____ appears naturally in the atmosphere from sources such as respiration, decomposition, and volcanic eruptions.

• O3

• CO2

• E3

• C3

Multiple Choice

What is NOT a natural source of air pollutants?

• Forest Fires

• Plants (esp. conifers) 

• Volcanoes

• Hydrogenated Charcoal

​Natural Sources of CO2 & PM

Fill in the Blank

Natural _____ Sources are:

Sea salt, pollen, ash from forest fires & volcanoes dust (windborne soil).

Leads to haze (scattering of sunlight & reduced visibility)

Multiple Choice

Size of particles from combustion (especially vehicles) smaller dust particles.

More likely to travel deep into the lungs due to smaller size.

Associated with chronic bronchitis and increased risk of lung cancer."

• PM 2.5 $$\mu$$  

• PM 10 $$\mu$$  

• PM12 $$\mu$$  

• PM8 $$\mu$$  

Multiple Choice

Size of particles or liquid droplets like dust, pollen, ash, or mold that are too small to be filtered out by nose hairs and trachea cilia; can irritate respiratory tract & cause inflammation"

• PM 2.5 $$\mu$$  

• PM 3.5 $$\mu$$  

• PM 10 $$\mu$$  

• PM 15 $$\mu$$  

Fill in the Blank

_____ decomposition =

Decomposition of organic matter by bacteria & decomposers in the presence of oxygen → releases CO2

Fill in the Blank

_____ decomposition=

Decomposition of organic matter by bacteria & decomposers in low or oxygen-free conditions → releases CH4 (methane)

Fill in the Blank

All living things (plants included) release CO2 through _____.

Multiple Choice

Which below can be considered an air pollutant?

• chemicals

• particulates

• microbes

• odorless gases

• all of these

Multiple Choice

Which is NOT a source of SO₂?

• combustion of fossil fuels

• volcanic eruptions

• forest fires

• lightning

• none of these are sources of SO₂

Multiple Choice

78% of the Earth's atmosphere is made up of

• H₂O

• SO₂

• N₂

• CO₂

• Ar

Multiple Choice

Which below is considered an air pollutant?

• stratospheric ozone

• tropospheric ozone

• exospheric ozone

• mesospheric ozone

• thermospheric ozone

Multiple Choice

Which below is a source of particulate matter?

• burning wood

• dust from gravel roads

• volcanoes

• forest fires

• all of these are sources of particulate matter

Multiple Choice

The global atmospheric CO₂ concentration in 1980 was

• 340 ppm

• 100 ppm

• 400 ppm

• 450 ppm

• 510 ppm

Multiple Choice

The global atmospheric CO₂ concentration in 2020 was

• 340 ppm

• 100 ppm

• 410 ppm

• 450 ppm

• 510 ppm

Multiple Choice

Volcanic eruptions can be sources of air pollution

• True

• False