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AIR QUALITY EARLY WARNING SYSTEM FOR DELHI
MINISTRY OF EARTH SCIENCES, GOVT. OF INDIA
पृथ्वी विज्ञान मंत्रालय, भारत सरकार
(Project By : Indian Institute of Tropical Meteorology, Pune)

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 Air Quality and Weather Bulletin for Delhi NCR (20.04.2021 )

1.      The air quality over Delhi-NCR is likely to remain in Moderate to Poor category on 20.04.2021. The dust concentration is likely to increase on 20.04.2021 owing to strong surface winds in the afternoon/evening. The air quality is likely to improve and remain in Moderate category on 21.04.2021 and 22.04.2021. The Outlook for subsequent 5 Days: The air quality is likely to remain largely in Moderate category.

2.      The predominant surface wind is likely to be coming from Northwest/Northeast directions of Delhi with wind speed 10-18 kmph, partly cloudy sky, duststorm/thunderstorm accompanied with very light rain and gusty winds (speed 40-50 kmph) on 20.04.2021. The predominant surface wind is likely to be coming from West/Northwest directions of Delhi with wind speed 08-15 kmph and partly cloudy sky with possibility of very light rain/drizzle on 21.04.2021. The predominant surface wind is likely to be coming from West/Northwest directions of Delhi with wind speed 05-18 kmph and mainly clear sky on 22.04.2021

3.      Higher dust concentration is likely over parts of Rajasthan, Haryana and Delhi. Strong winds 20th April are likely raise dust concentration and transportation of dust from neighbouring regions to Delhi/NCR.

4.      Predicted maximum mixing depth is likely to be approx 3500 m on 20.04.2021, 3800 m on 21.04.2021 and 3700 m on 22.04.2021 over Delhi. Maximum Ventilation index is likely to be approx 5000 m2/s on 20.04.2021, 30000 m2/s on 21.04.2021 and 24000 m2/s on 22.04.2021. The ventilation index lower than 6000 m2/s with average wind speed less than 10 kmph is unfavourable for dispersion of pollutants

 

5.      Detailed forecast analysis and verification can be seen at https://ews.tropmet.res.in.

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Current AQI
Forecast
Mid Visibility IGIA
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Air Quality Index Range

Good

AQI: Good (0 - 50)
Air quality is considered satisfactory, and air pollution poses little or no risk.

Satisfactory

AQI: Satisfactory (51 - 100)
Air quality is considered satisfactory, and air pollution poses little or no risk.

Moderate

AQI: Moderate (101 - 200)
Air quality is acceptable; however, for some pollutants there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.

Poor

AQI: Poor for Sensitive Groups (201 - 300)
Although general public is not likely to be affected at this AQI range, people with lung disease, older adults and children are at a greater risk from exposure to ozone, whereas persons with heart and lung disease, older adults and children are at greater risk from the presence of particles in the air.

Very Poor

AQI: Very Poor (301 - 400)
Health alert: everyone may experience more serious health effects.

Severe

AQI: Severe (401 - 500)
Health warnings of emergency conditions. The entire population is more likely to be affected.

X

Visibility Range

CAT - IIIC

VISIBILITY: Below 50 M
CAT - IIIB

VISIBILITY: FROM 50M TO 174M
CAT - IIIA

VISIBILITY: FROM 175M TO 299M

CAT - II

VISIBILITY: FROM 300M TO 549M

CAT -I

VISIBILITY: 500M AND ABOVE

Air Quality Forecast Over India

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