Question

1. how is ozone both helpful and harmful depending on location?

Explanation:

Ozone ($O_3$) in the stratosphere (high altitude) is helpful as it absorbs most of the Sun's harmful ultraviolet (UV) radiation, protecting life on Earth from skin cancer, cataracts, and damage to ecosystems. In the troposphere (near the Earth's surface, ground - level ozone), it is harmful. It is a major component of smog, can irritate the respiratory system, cause breathing difficulties, and damage plants and materials.

Answer:

Ozone in the stratosphere is helpful (absorbs UV radiation, protects life), while in the troposphere (ground - level) it is harmful (causes respiratory issues, smog, damages plants/materials).