Photochemical Smog - AP Environmental Science

Peaks in the afternoon when sunlight is strongest. Maximum solar radiation occurs midday, driving peak photochemical activity.

Reaction of NOx and VOCs in sunlight. Primary pollutants undergo photochemical reactions in the presence of UV radiation.

Absorb pollutants and release oxygen. Vegetation acts as natural air filters, removing pollutants from the atmosphere.

Industrial processes and vehicle emissions. Manufacturing and fuel combustion release organic compounds that evaporate into the atmosphere.

Reduces natural VOC absorption, increasing smog potential. Trees naturally absorb VOCs and release oxygen, losing this benefit increases pollution.

Contribute to NOx and VOC levels, increasing smog. Factories release both primary pollutants that react to form secondary smog components.

Efficient urban planning can reduce emissions and smog. Smart design reduces vehicle dependence and concentrates pollution sources.

Implementing stricter regulations on industrial emissions. Industry controls reduce organic compound releases through better technology and standards.

Reducing emissions from vehicles and industrial sources. Controlling precursor pollutants prevents photochemical reactions that form smog.

Lower wind speeds can lead to higher smog concentrations. Weak winds reduce pollutant dispersion, allowing concentrations to build up locally.

Traps pollutants near the ground, increasing smog concentration. Warm air above cool air prevents vertical mixing, trapping pollutants at ground level.

Warm temperatures and sunlight. Heat accelerates chemical reactions and sunlight provides energy for photochemical processes.

Drives the chemical reactions that form smog. UV radiation provides energy to break chemical bonds and initiate ozone formation.

Convert NOx into less harmful substances. Chemical catalysts reduce nitrogen oxides to nitrogen and water in exhaust systems.

Reduce NOx emissions, decreasing smog formation. Electric motors produce no tailpipe emissions, eliminating NOx sources.

Chronic respiratory diseases. Repeated exposure causes permanent lung damage and increases disease risk.

Air quality indices and ozone concentration levels. Air quality monitors track pollutant concentrations and calculate exposure risks.

React with VOCs in sunlight to create ozone. NOx acts as a catalyst in photochemical reactions that produce ground-level ozone.

Ozone damages ecosystems and reduces biodiversity. Ground-level ozone harms vegetation and disrupts food webs.

Particulate matter. Fine particles scatter light, creating haze and reducing visibility.

Promoting public transportation to reduce vehicle emissions. Mass transit reduces individual vehicle use and total emissions per capita.

Troposphere. Ground-level air layer where humans live and breathe the polluted air.

Can lead to acid rain, affecting aquatic ecosystems. Smog components can form acids that lower water pH and harm aquatic life.

Increases temperatures, enhancing smog formation. Higher urban temperatures accelerate photochemical reaction rates.

Indicates the role of sunlight in forming smog. Light-driven chemical reactions distinguish it from other types of air pollution.

Establishes regulations to control air pollution. Federal legislation sets emission standards and air quality requirements for states.

Damages leaves and reduces photosynthesis. Ozone damages cell membranes and disrupts cellular processes in plants.

High humidity can reduce smog formation. Water vapor can scavenge some pollutants and affect reaction rates.

Respiratory issues, eye irritation, reduced lung function. Ozone and other pollutants irritate airways and damage respiratory tissue.