"pollution"

The city recorded an air quality index (AQI) of 315 at 11:10 am. The last time the air quality hit such a poor level was in February.

An AQI between 0 and 50 is considered 'good', 51 and 100 'satisfactory', 101 and 200 'moderate', 201 and 300 'poor', 301 and 400 'very poor', and 401 and 500 'severe'.

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