IB ESS HL 8.3.1 Urban air pollutants Question Bank
Practise IB ESS SL/HL 8.3.1 by applying urban air pollutants concepts to exam-style environmental systems questions.
- Syllabus
- First assessment 2026
- Course
- ESS HL
- Level
- HL
Practise IB ESS SL/HL 8.3.1 by applying urban air pollutants concepts to exam-style environmental systems questions.

Figure:Atmospheric pollutants associated with photochemical smog
Identify one primary pollutant from the pollutants shown in the photochemical-smog pollutant chart shown above.
NO/NO2/hydrocarbons;
Outline why the pollutant named in Question 3 (a)(i) is referred to as a primary pollutant.
impacts environment directly on emission / undergoes no chemical change before impacting environment / is active on emission;
Note: Even if response to 3(a) (i) is wrong full credit (ECF) can be given for appropriate definition of primary pollutant.