PBHL 202 Exam #3 Review: Water Quality, Air Quality, and Food Safety

Vocabulary practice cards providing precise, transcript-grounded definitions for PBHL 202 Exam #3, covering environmental water safety, data center resource stress, ambient air pollution standards, food microbiology, and regulatory history.

Source Water

Untreated water used to make drinking water; the starting point of the drinking water supply.

Finished Water

Water leaving a treatment plant that is collected, treated, usually filtered, and ready for consumers to drink.

Surface Water

Water originating from open, above-ground freshwater sources such as lakes, streams, rivers, and surface springs.

Groundwater

Water stored naturally deep in underground aquifers or flowing through rock and soil, which supplies springs and wells.

Aquifer

A layer or section of earth, gravel, sand, or rock that holds and yields freshwater.

Groundwater Under the Direct Influence of Surface Water (GUDI)

Groundwater that is not adequately protected from surface water infiltration, allowing surface contaminants and microbes to enter; regulated and treated like surface water.

Hydrological Cycle

The natural continuous cycle wherein water evaporates from oceans and water bodies, condenses as vapor in clouds, and falls back to Earth as precipitation.

Nonrenewable Water

Water located in aquifers or reservoirs that is not recharged by the hydrological cycle, or is recharged so slowly that excessive withdrawal depletes it.

Renewable Water

Freshwater that is continuously replenished by the hydrological cycle and remains available for withdrawal within reasonable time limits.

Reservoir

An artificial, man-made lake created by building a barrier or dam across a flowing river to store water for human use.

Runoff

Precipitation that moves across land surfaces into rivers, streams, and lakes, potentially carrying pollutants such as fertilizers, oil, and road salt into aquatic bodies or aquifers.

Water Withdrawal

The removal of freshwater from any natural source or reservoir (including lakes, rivers, or aquifers) for human purposes.

Water Scarcity

A severe shortage where the annual renewable freshwater supply is less than $1,000\,\text{m}^3$ per person.

Water Stress

A condition in which the annual renewable freshwater supply is between $1,000\,\text{m}^3$ and $1,700\,\text{m}^3$ per person.

Waterborne Diseases

Illnesses transmitted by ingesting water that passively carries infectious microbial pathogens.

Water Disinfection By-Products

Chemical compounds formed when water disinfectants (such as chlorine, chloramines, chlorine dioxide, or ozone) react with organic material in the water; associated with adverse reproductive outcomes.

Safe Drinking Water Act (SDWA)

Federal legislation authorizing the EPA to establish national drinking water quality standards and oversee compliance by state, local, and public water suppliers.

Clean Water Act (CWA)

Federal law establishing the basic structure for regulating discharges of pollutants into United States waters and setting quality standards for surface waters.

Data Center

A dedicated facility housing network servers and computing equipment used to process, store, and transmit digital information.

Hyperscale Data Center

A massive facility operating computing infrastructure at an exceptionally large scale, resulting in significantly increased water and cooling demands.

Groundwater Depletion

The long-term lowering of groundwater levels when withdrawal rates exceed natural recharge rates, which can reduce household well capacity.

Water Table

The upper boundary surface of the underground zone that is saturated with water.

Direct Water Use (Data Centers)

Water consumed on-site at the facility, predominantly utilized in cooling systems to absorb and dissipate heat generated by servers.

Indirect Water Use (Data Centers)

Off-site water consumed during the generation of electricity that powers the facility and during the manufacturing of semiconductor chips and computer equipment.

Thermal Pollution

The degradation of ambient water quality caused by the discharge of heated effluent from industrial processes or cooling operations back into natural water bodies.

Smog

A complex mixture of atmospheric pollutants, primarily composed of ground-level ozone, formed through chemical reactions among precursor emissions in the presence of sunlight.

Anthropogenic Sources of Air Pollution

Pollution originating from human activities, including electric generating plants, manufacturing factories, oil refineries, chemical plants, incinerators, and motor vehicles.

Natural Sources of Air Pollution

Non-human origins of air contaminants, including volcanic eruptions, wildfires, dust storms, airborne pollen, and sea spray.

Criteria Air Pollutants

A group of six widespread air pollutants regulated by the EPA based on health and environmental criteria: particulate matter, ozone, nitrogen oxides, carbon monoxide, sulfur dioxide, and lead.

Particulate Matter (PM)

A suspension of fine solid particles and liquid droplets in the air; categorized into sizes such as $\text{PM}_{10}$ and the finer $\text{PM}_{2.5}$, which can penetrate deep into lung tissue.

Ozone ($\text{O}_3$)

A triatomic gas of three oxygen atoms that constitutes the principal hazardous component of ground-level photochemical smog, formed when precursors react with ultraviolet radiation.

Nitrogen Oxides ($\text{NO}_x$)

Combustion gases containing nitrogen and varying proportions of oxygen that react with volatile organic compounds (VOCs) to generate smog and with moisture to form acid rain.

Carbon Monoxide (CO)

A colorless, odorless, toxic gas generated by the incomplete combustion of carbon-based fuels like gasoline, wood, and oil.

Sulfur Dioxide ($\text{SO}_2$)

A noxious gas produced by burning sulfur-bearing fossil fuels, predominantly coal, which contributes significantly to the formation of acid rain.

Acid Rain

Precipitation containing elevated levels of acidic compounds formed when sulfur dioxide ($\text{SO}_2$) and nitrogen oxides ($\text{NO}_x$) react with atmospheric water, oxygen, and oxidants.

Acid Rain Cycle

The environmental sequence wherein combustion of fossil fuels releases $\text{SO}_2$ and $\text{NO}_x$, which oxidize in the atmosphere to form acids, and ultimately precipitate onto aquatic and terrestrial ecosystems.

Temperature Inversion

An atmospheric event where a layer of warm air traps cooler air near the ground surface, preventing vertical circulation and causing pollutants to accumulate at dangerous levels.

Air Quality Index (AQI)

A standardized numerical system used by government agencies to communicate daily air pollution levels and associated public health concerns to the general public.

National Ambient Air Quality Standards (NAAQS)

Federal standards established by the EPA under the Clean Air Act that dictate permissible concentration limits for criteria pollutants to protect public health and welfare.

Clean Air Act

A comprehensive federal statute governing air emissions from both stationary and mobile sources, empowering the EPA to formulate NAAQS and control hazardous air pollutants.

Sick Building Syndrome (SBS)

A condition where occupants experience acute health or comfort complaints linked directly to time spent in a building, despite the absence of an identifiable specific illness or cause.

Building-Related Illness (BRI)

A clinically diagnosed illness directly traceable to specific airborne biological or chemical contaminants present within a building.

Global Warming

An observed rise in the average surface temperature of the Earth, driven largely by atmospheric accumulation of anthropogenic greenhouse gas emissions and extensive deforestation.

Greenhouse Gases

Atmospheric gases from natural processes and human combustion activities that absorb infrared radiation, trapping thermal energy and warming the Earth.

Kyoto Protocol

An international, legally binding climate agreement initiated in $1997$ in Kyoto, Japan, committed to reducing greenhouse gas emissions among signatory nations.

Paris Agreement

An international climate treaty adopted in $2015$ where nations set voluntary nationally determined pledges to limit average global warming to well below $2\,^\circ\text{C}$, aiming for $1.5\,^\circ\text{C}$.

Foodborne Intoxications

Foodborne illnesses caused by ingesting preformed microbial toxins or spores produced while organisms multiply in food prior to consumption.

Foodborne Infections

Foodborne diseases triggered by ingesting food contaminated with viable pathogenic microorganisms that directly invade and colonize the gastrointestinal tract.

Foodborne Outbreak

An incident in which $2$ or more individuals experience a similar illness shown by epidemiological investigation to originate from a shared food or meal.

Salmonella

A genus of bacterial pathogens hosted by wild and domestic animals, pets, and chronic carriers, spread to foods via contaminated surfaces, feces, soil, and water.

Clostridium botulinum

An anaerobic, spore-forming bacterium that produces a lethal neurotoxin, responsible for the disease botulism.

Staphylococcus aureus

A bacterial pathogen that produces foodborne illness, listed in lecture slides as growing in anaerobic conditions and forming spores.

Trichinosis

A parasitic infection caused by tissue-invading roundworms, contracted through consumption of raw or undercooked infected meats, particularly pork.

Tapeworms

Parasitic flatworms causing taeniasis in humans following the ingestion of undercooked, infected beef or pork containing larval cysts.

Norovirus

A highly contagious viral pathogen responsible for severe gastroenteritis outbreaks, notoriously prevalent in closed community settings like cruise ships.

Hepatitis A

A viral liver infection frequently traced to contaminated shellfish or transmitted via the fecal-oral route by infected food-service personnel.

Prions

Infectious proteinaceous or virus-like particles that induce fatal neurodegenerative disorders in animal and human hosts.

Bovine Spongiform Encephalopathy (BSE)

A transmissible, fatal neurodegenerative disease of cattle caused by abnormal prions, commonly known as 'mad cow disease.'

Creutzfeldt-Jakob Disease (CJD)

A rapidly progressive, fatal neurodegenerative brain disorder in humans that can be caused by infectious prion agents.

Heavy Metals (in Food)

Metallic elements of high atomic weight and density exceeding water that leach into food supplies, such as lead in candy packaging, arsenic in poultry, or mercury in fish.

Food Additives

Substances intentionally added to food to preserve freshness, enhance flavor, alter appearance, or modify nutritional qualities.

Preservatives

Additives that prevent deterioration and inhibit microbial growth (bacteria, yeasts, molds), such as nitrates in processed meats and BHA/BHT in edible oils and cereals.

Hazard Analysis of Critical Control Points (HACCP)

A systematic, preventive management protocol designed to minimize foodborne illness risks by identifying, monitoring, and controlling hazards from harvest through consumption.

Delaney Clause

A provision within the $1958$ Food Additives Amendment prohibiting the approval of any food additive shown to induce cancer in humans or animals; repealed by the $1996$ FQPA.

Generally Recognized As Safe (GRAS)

A regulatory designation denoting food substances considered safe among experts based on long-established history of common consumption or extensive scientific proof.

Escherichia coli O157:H7

A pathogenic bacterial strain found in undercooked ground beef that produces Shiga toxin, responsible for the major $1993$ Jack in the Box outbreak.

Shiga Toxin

A cellular cytotoxin produced by Escherichia coli O157:H7 that causes hemorrhagic colitis by damaging intestinal tissues and microvascular endothelial cells.

Hemolytic Uremic Syndrome (HUS)

A severe clinical syndrome marked by microangiopathic hemolytic anemia, thrombocytopenia (low platelet counts), and acute renal injury; children are particularly susceptible.

Food Supply Chain

The entire connected progression through which food moves from agricultural production, processing, and storage to distribution and consumer preparation.

Food Recall

The removal of a contaminated or adulterated food product from trade, distribution, and retail shelves to prevent public exposure, facilitated by lot traceability.

Adulterant

A contaminant, biological agent, or deleterious substance whose presence in food renders it legally unwholesome, hazardous, and illegal for commercial sale.

Zero Tolerance Policy

A regulatory policy establishing that any confirmed detection of a specified pathogen (e.g., E. coli O157:H7) in ground beef renders the entire batch unfit and prohibited from distribution.

Internal Cooking Temperature

The core thermal measurement determined using a calibrated food thermometer inside the thickest part of food to ensure pathogen destruction, rather than relying on visual appearance.

Public Health Surveillance

The continuous, systematic collection, laboratory analysis, and interpretation of health data to detect disease clusters, track trends, and identify foodborne outbreaks.

Regulatory Enforcement

The application of mandated inspections, audits, and statutory corrective actions to guarantee industrial compliance with food and environmental safety regulations.

Risk Communication

The rapid and transparent exchange of essential safety information, instructing consumers on necessary preventive actions while openly acknowledging areas of scientific uncertainty.