Across
- 2. the natural world, as a whole or in a particular geographical area, especially as affected by human activity
- 3. the presence in or introduction into the environment of a substance which has harmful or poisonous effects
- 5. the magnitude or intensity that must be exceeded for a certain reaction, phenomenon, result, or condition to occur or be manifested
- 7. fog or haze intensified by smoke or other atmospheric pollutants
- 8. the state of being clear of trees
- 13. inhalation and exhalation of air; breathing
- 15. contrary to or forbidden by law, especially criminal law
- 18. a process in which substances combine chemically with oxygen from the air and typically give out bright light, heat, and smoke; combustion or burning
- 19. the state of being free from illness or injury
- 20. burn slowly with smoke but no flame
- 22. a course or principle of action adopted or proposed by an organization or individual
- 23. a visible suspension of carbon or other particles in air, typically one emitted from a burning substance
- 24. a time of intense difficulty or danger
Down
- 1. performed an act, usually with a negative connotation
- 4. a fact or situation that is observed to exist or happen, especially one whose cause or explanation is in question
- 6. continuing with great force or intensity
- 9. the degree or intensity of heat present in a substance or object, especially as expressed according to a comparative scale and shown by a thermometer or perceived by touch
- 10. a slight obscuration of the lower atmosphere, typically caused by fine suspended particles
- 11. the production and discharge of something, especially gas or radiation
- 12. the state of the atmosphere at a particular place and time as regards heat, cloudiness, dryness, sunshine, wind, rain
- 14. cover or envelop so as to conceal from view
- 16. a small area with a relatively high temperature in comparison to its surroundings
- 17. matters or situations regarded as unwelcome or harmful and needing to be dealt with and overcome
- 21. interrupt (an event, activity, or process) by causing a disturbance or problem
