air quality index
A numerical scale used to communicate how polluted the air currently is or is forecast to become.
writing-task-1Environment
Utilisation IELTS
Used in task 1 to describe pollution levels and trends, often presented in line graphs or tables.
Exemples
- The air quality index reached unhealthy levels in several cities.
- Between 2010 and 2020, the average air quality index improved by 20%.
- The line graph shows daily fluctuations in the air quality index.
- A high air quality index indicates significant pollution.
Collocations
- air quality index reading
- The air quality index reading was over 150 in the capital.
- improve the air quality index
- Measures have been taken to improve the air quality index.
- average air quality index
- The table presents the average air quality index for different months.
- air quality index rose
- The air quality index rose sharply during the winter months.
Famille de mots
- Nom
- index
- Adjectif
- air-quality
Paraphrases
- pollution index: Shorter alternative; may be used if the context is clear.
- AQI: Abbreviation common in academic and official reports.
- air pollution level: Broader term, but can be used when the scale is not specified.
Erreurs courantes
- air quality index are high to the air quality index is high. Subject-verb agreement: 'index' is singular.
- air quality index number to air quality index value. 'Value' is more precise than 'number' in academic contexts.
- air quality index increased 50% to the air quality index increased by 50%. Missing preposition 'by' before the percentage.