6.3-6.4: Photochemical Smog & Acid
Deposition
a primary pollutant - ANS pollution that is released directly into the atmosphere.
a secondary pollutant - ANS a pollutant that develops after a chemical reaction with chemicals
normally present in the atmosphere.
What are some examples of a primary pollutant that are the result of a combustion of fossil
fuels? - ANS -Most of this air pollution we cause results from the burning of fossil fuels, such as
coal, oil, natural gas, and gasoline to produce electricity and power our vehicles.
-Carbon dioxide (CO2) is a good indicator of how much fossil fuel is burned and how much
other pollutants are emitted as a result.
secondary pollutants that are the result of a combustion of fossil fuels - ANS Secondary
pollutants form when primary pollutants emitted directly from a combustion process react in the
atmosphere. Primary pollutants include ammonia, sulfur dioxide, nitrogen dioxide and carbon
monoxide. Secondary pollutants include ground-level ozone, acid rain and nutrient enrichment
compounds
How is the troposphere ozone formed? - ANS The majority of tropospheric ozone formation
occurs when nitrogen oxides (NOx), carbon monoxide (CO) and volatile organic compounds
(VOCs), such as xylene, react in the atmosphere in the presence of sunlight.
negative effects the troposphere ozone has on living things - ANS Breathing ozone can trigger
a variety of health problems including :
-chest pain, coughing, throat irritation, and airway inflammation.
-reduce lung function and harm lung tissue.
-Ozone can worsen bronchitis, emphysema, and asthma , leading to increased medical care.
photochemical smog - ANS a mixture of many irritating chemicals formed when auto exhausts
react with oxygen in sunlight
harmful effects of smog - ANS -Worsening of asthma symptoms: If you suffer from asthma,
exposure to high levels of ozone from smog can trigger asthma attacks. -Difficulty breathing and
lung damage: Smog can make it difficult to breathe deeply, especially during exercise, according
to the Mayo Clinic.
smog precursors - ANS cars, buses, etc.
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