The AQI for 2021 period indicates 7 cities in the AQI band of 150 to 350 whereas majority of the cities were in the AQI band of 150 to 250 barring Asansol which had an AQI of 376 2021 has seen rise in AQI of Korba which remained under 100 during June-September period in 2020 Asansol's AQI remained between 100 and 150 for both the periods from April to September for 2020 and 2021 Table 1 – AQ. [...] The median value for 2020 was 34 where as it reached 41 in 2021 1 January to September 2020 and 2021 Median value of AQI for Korba in 2020 was 103 whereas in 2021 it is 133 for the 9 months period from January till September indicating that the AQI has worsened Median value of AQI for Asansol in 2020 was 144 whereas in 2021 it is 118 for the 9 months period from January till September indicati. [...] Majority of the days in June till July remained in Satisfactory conditions whereas in September 50% of the times it has been in good and satisfactory category of AQI Korba – Moderately polluted for most of the times in April and May whereas in June and July 60% of the AQI categories migrated to poor, very poor and severe. [...] In April and May maximum number of days were in satisfactory category whereas the AQI categories transitioned to good category for June and July. [...] August showed a bit of improvement with 11 days in satisfactory category Sambalpur – April and May months remained maximum in moderately polluted category (23 & 24 days) and rest of the days in satisfactory category.
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