An AQI between 0-50 is considered "Good", 51-100 "Satisfactory", 101-200 "Moderate", 201-300 "Poor", 301-400 "Very Poor", and 401-500 "Severe".
Gufran Beig, a scientist at the Centre-run System of Air Quality and Weather Forecasting and Research institute (SAFAR), said incessant rain in surrounding areas of Delhi has led to the flow of clean moisture-laden winds into the city that is cleansing the air.
Delhiites breathed clean air last month after nearly a year. The pollution level has since been in check and has remained at satisfactory or moderate level.
There was a dip in the air quality on June 13 due to dust storms in western India that pushed the pollution level to "severe plus", bringing to light that emergency level pollution could be a "summer-time problem" too.
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