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Delhi’s AQI falls to very poor category, says SAFAR

According to the System of Air Quality and Weather Forecasting And Research (SAFAR), the Air Quality Index(AQI) of the national capital has deteriorated further on Saturday. It further slipped from the ‘moderate’ category to the ‘very poor’ category. The Air Quality Index was reported 339.

When was the Air Quality Index of Delhi was in the ‘satisfactory’ category?

However, according to the official statements, the Air Quality Index (AQI) was recorded in the ‘satisfactory’ category from the last three days. THe days were from January 9, 2022 to January 11, 2022.

What has been said by the Indian Meterological Departement for Delhi’s AQI?

Meanwhile, it has been said by the Indian Meteorological Department that 14 January 2022 was the ” “longest foggy day of the season.”The visibility was improved around 4 pm in the evening in the national capital on Friday.

Besides this, they also said that there was a layer of dense fog in the morning and moderate fog all over the day in Delhi -NCR, west Uttar Pradesh, Punjab, Haryana, and north-Rajasthan. This prevents the sunlight from reaching the surface. Also, the north westerlies were blowing in these regions. All these conditions led to a cold day.

Also, according to the Indian Meteorological Department, ‘dense fog’ is expected for the next four days in Delhi.

What are the different categories of AQI?

According to the government agencies, an AQI which lies in between 0-50 is considered as ‘good’, between 51-100 is known as ‘satisfactory.’ While AQI in between 101-200 is called ‘moderate’, 201-300 is known as ‘poor’, 301- 400 is considered as ‘very poor’, and 401-500 stands in the ‘severe’ category.

How fog has been categorised by the officials?

As per the officials, when visibility diminished up to 0-50 metres, it is known as ‘very dense’ fog. But, when visibility reduces to between 51-100 metres, then it is known as ‘dense fog.’ However, when the visibility reduces to between 201 and 500 metres, then it is known as ‘moderate and ‘shallow’ is known when the visibility reduces to 501 and 1,000 metres.

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