All flashcards
Flashcard 1: How is photochemical smog measured?
Answer: Air quality indices and ozone concentration levels. Air quality monitors track pollutant concentrations and calculate exposure risks.
Flashcard 2: Describe the daily pattern of photochemical smog levels.
Answer: Peaks in the afternoon when sunlight is strongest. Maximum solar radiation occurs midday, driving peak photochemical activity.
Flashcard 3: What is the main cause of increased ozone levels in urban areas?
Answer: Reaction of NOx and VOCs in sunlight. Primary pollutants undergo photochemical reactions in the presence of UV radiation.
Flashcard 4: How do trees help mitigate photochemical smog?
Answer: Absorb pollutants and release oxygen. Vegetation acts as natural air filters, removing pollutants from the atmosphere.
Flashcard 5: What is the primary source of VOCs in urban environments?
Answer: Industrial processes and vehicle emissions. Manufacturing and fuel combustion release organic compounds that evaporate into the atmosphere.
Flashcard 6: How does deforestation contribute to photochemical smog?
Answer: Reduces natural VOC absorption, increasing smog potential. Trees naturally absorb VOCs and release oxygen, losing this benefit increases pollution.
Flashcard 7: How do industrial emissions affect photochemical smog?
Answer: Contribute to NOx and VOC levels, increasing smog. Factories release both primary pollutants that react to form secondary smog components.
Flashcard 8: What is the impact of urban planning on smog levels?
Answer: Efficient urban planning can reduce emissions and smog. Smart design reduces vehicle dependence and concentrates pollution sources.
Flashcard 9: Identify a method to reduce VOC emissions.
Answer: Implementing stricter regulations on industrial emissions. Industry controls reduce organic compound releases through better technology and standards.
Flashcard 10: What regulatory measure can reduce photochemical smog?
Answer: Reducing emissions from vehicles and industrial sources. Controlling precursor pollutants prevents photochemical reactions that form smog.
Flashcard 11: How does wind speed affect photochemical smog formation?
Answer: Lower wind speeds can lead to higher smog concentrations. Weak winds reduce pollutant dispersion, allowing concentrations to build up locally.
Flashcard 12: How does temperature inversion affect smog levels?
Answer: Traps pollutants near the ground, increasing smog concentration. Warm air above cool air prevents vertical mixing, trapping pollutants at ground level.
Flashcard 13: Which conditions enhance photochemical smog formation?
Answer: Warm temperatures and sunlight. Heat accelerates chemical reactions and sunlight provides energy for photochemical processes.
Flashcard 14: What role does sunlight play in photochemical smog?
Answer: Drives the chemical reactions that form smog. UV radiation provides energy to break chemical bonds and initiate ozone formation.
Flashcard 15: How do catalytic converters help reduce smog?
Answer: Convert NOx into less harmful substances. Chemical catalysts reduce nitrogen oxides to nitrogen and water in exhaust systems.
Flashcard 16: How do electric vehicles impact photochemical smog?
Answer: Reduce NOx emissions, decreasing smog formation. Electric motors produce no tailpipe emissions, eliminating NOx sources.
Flashcard 17: What is a major consequence of long-term smog exposure?
Answer: Chronic respiratory diseases. Repeated exposure causes permanent lung damage and increases disease risk.
Flashcard 18: How is photochemical smog measured?
Answer: Air quality indices and ozone concentration levels. Air quality monitors track pollutant concentrations and calculate exposure risks.
Flashcard 19: What is the role of nitrogen oxides in smog formation?
Answer: React with VOCs in sunlight to create ozone. NOx acts as a catalyst in photochemical reactions that produce ground-level ozone.
Flashcard 20: What is the main environmental impact of ozone in smog?
Answer: Ozone damages ecosystems and reduces biodiversity. Ground-level ozone harms vegetation and disrupts food webs.
Flashcard 21: Which component of smog affects visibility the most?
Answer: Particulate matter. Fine particles scatter light, creating haze and reducing visibility.
Flashcard 22: Identify a health policy to mitigate smog impact.
Answer: Promoting public transportation to reduce vehicle emissions. Mass transit reduces individual vehicle use and total emissions per capita.
Flashcard 23: Which atmospheric layer is affected by photochemical smog?
Answer: Troposphere. Ground-level air layer where humans live and breathe the polluted air.
Flashcard 24: What is the impact of smog on water bodies?
Answer: Can lead to acid rain, affecting aquatic ecosystems. Smog components can form acids that lower water pH and harm aquatic life.
Flashcard 25: How does urban heat island effect influence smog?
Answer: Increases temperatures, enhancing smog formation. Higher urban temperatures accelerate photochemical reaction rates.
Flashcard 26: What is the significance of the term 'photochemical' in smog?
Answer: Indicates the role of sunlight in forming smog. Light-driven chemical reactions distinguish it from other types of air pollution.
Flashcard 27: What is the role of the Clean Air Act in addressing smog?
Answer: Establishes regulations to control air pollution. Federal legislation sets emission standards and air quality requirements for states.
Flashcard 28: What are the effects of smog on plant life?
Answer: Damages leaves and reduces photosynthesis. Ozone damages cell membranes and disrupts cellular processes in plants.
Flashcard 29: How does humidity affect photochemical smog?
Answer: High humidity can reduce smog formation. Water vapor can scavenge some pollutants and affect reaction rates.
Flashcard 30: What health effects are associated with photochemical smog?
Answer: Respiratory issues, eye irritation, reduced lung function. Ozone and other pollutants irritate airways and damage respiratory tissue.