Aquatic & Terrestrial Pollution

Gastrointestinal problems

Respiratory problems

Cardiovascular diseases

Endocrine disruption

The dose that produces a specific effect in 50% of a population.

The dose that is lethal to 100% of a population.

The dose that is lethal to 50% of a test population.

The dose that has no effect on a population.

Agricultural runoff

Factory pipe discharging waste into a river

Stormwater runoff from city streets

Construction site erosion

They break down quickly in the environment

They do not bioaccumulate in organisms

They are synthetic chemicals that persist in the environment

They are easily diluted in water

Acid rain

Excessive nutrients

Thermal pollution

Oil spills

Substance A

Substance B

They have equal toxicity

Toxicity cannot be determined from $LD_{50}$ alone

A leaking underground storage tank

A sewage treatment plant

Agricultural fields

A factory discharging wastewater

Middle-aged adults

Teenagers

Children and the elderly

Young adults

The economic benefits of using the pesticide outweigh the potential risks.

The pesticide should be approved for use since it is not very toxic to insects.

The potential harm to human and wildlife populations from endocrine disruption needs careful evaluation, even at low concentrations.

The pesticide should be used only in areas with high insect populations.

Increased water clarity leading to greater biodiversity.

The depletion of oxygen due to algal blooms, leading to dead zones.

The decrease in nutrient levels, benefiting sensitive aquatic species.

The increase in pH levels, creating a more habitable environment for fish.