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Lecture 9

Environmental Science 1021F/G Lecture Notes - Lecture 9: Coriolis Force, Ozone Depletion, Howstuffworks


Department
Environmental Science
Course Code
ENVSCI 1021F/G
Professor
Christie Stewart
Lecture
9

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Air Pollution
-More matter near the surface of the earth because
of gravity
Stratosphere: good ozone, protects us from UV rays
from the sun. Less water vapour, less matter
O2 + UV sun = good O3
Troposphere: contains the air we breath,
responsible for weather and climate
-Biogeochemical cycles (nutrient cycling) cycling from
soil/water into atmosphere
VOCs + NO(x) + sun = bad O3
(volatile organic compounds)
(nitrogen oxides)- mostly from burning of fossil
fuels
Air Pollution: chemicals in the atmosphere at concentrations high enough to affect climate/
harm organisms and materials
3 sources: mobile(cars), stationary(agriculture, mining), natural (vocs, plant decay, forest
fires, volcanoes)
1. Photochemical Smog
NOx + VOCs + heat + UV = 100s pollutants (including bad ozone)
-smog effects plants ability to photosynthesize, which decreases net primary productivity
-Some species emit VOCs
-Problematic if arrested areas close to urban areas
-Selectivity in species planting encouraged in urban areas
2. Industrial Smog
-Consists of sulphur dioxide, droplets of sulphuric acid, suspended solid particles
-Currently less problematic in developed countries than developing ones because they use
cheaper coal that may not have sulphur removed, don’t have as many regulations
Air Pollution
-Natural factors that reduce formation
>rain, snow and salty sea spray, wind
-Areas that have tall buildings, valleys, mountains increase formation because it gets trapped
-High temperatures because you need heat to produce smog
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