Air Quality Early Warning System For Delhi

Bulletin & Message

Air Quality and Weather Bulletin for Delhi (19.05.2025)

दिल्लीकेलिएवायुगुणवत्ताऔरमौसमबुलेटिन (19.05.2025)

1. Past Weather and Air Quality Observation: The air quality over Delhi was in Moderate category with CPCB AQI 179 at 4 PM on 18.05.2025. There has been rise in minimum temperature up to 02°C and rise in maximum temperature up to 01°C over Delhi/NCR during the past 24 hours. The maximum and minimum temperatures over Delhi are in the range of 41 to 43°C and 26 to 28°C respectively. The minimum temperature was near normal and the maximum temperature was near normal at most places over Delhi/NCR. Partly cloudy sky conditions with predominant surface wind from the northwest/Southeast direction with wind speeds less than 18 kmph prevailed during the past 24 hours. Partly cloudy sky conditions with wind speed less than 15 kmph from the east direction prevailed over the region in the forenoon today.

2. Partly cloudy sky. Very light rain to light rain accompanied with thunderstorm/lighting and gusty winds (speed 30 – 40 kmph) temporarily reaching to 50 kmph during thunderstorm with dust rising surface winds towards evening/night. The maximum temperatures over Delhi are likely to be in the range of 38 to 40°C. The maximum temperature will be below normal up to 01 - 03°C. The predominant surface wind will likely be from the northwest direction with a wind speed of less than 20 kmph till evening. It would decrease becoming less than 12 kmph from the southwest direction during the night on 19.05.2024. Partly cloudy sky. Very light rain to light rain accompanied with thunderstorm/lighting and gusty winds (speed 30 – 40 kmph) temporarily reaching to 50 kmph during thunderstorm with dust rising surface winds. The maximum and minimum temperatures over Delhi are likely to be in the range of 38 to 40°C and 27 to 29°C respectively. The minimum temperature will be above normal up to 01 - 03°C and the maximum temperature will be below normal up to 01 - 02°C. The predominant surface wind will likely be from the northwest direction with a wind speed of 12-18 kmph during morning hours. The wind speed will gradually increase becoming 16-20 kmph from the west direction in the afternoon. It will decrease becoming less than 18 kmph from the west direction during evening and night on 20.05.2025. Partly cloudy sky. Very light rain to light rain accompanied with thunderstorm/lighting and gusty winds (speed 30 – 40 kmph) temporarily reaching to 50 kmph during thunderstorm with dust rising surface winds. The maximum and minimum temperatures over Delhi are likely to be in the range of 37 to 39°C and 27 to 29°C respectively. The minimum temperature will be above normal up to 01 - 03°C and the maximum temperature will be below normal up to 01 - 03°C. The predominant surface wind will likely be from the northwest direction with a wind speed of less than 25 kmph during the morning hours. The wind speed will gradually decrease becoming 15-20 kmph from the northwest direction in the afternoon. It will decrease becoming less than 16 kmph from the west direction during evening and night on 21.05.2025. Partly cloudy sky. Very light rain to light rain accompanied with thunderstorm/lighting and gusty winds (speed 30 – 40 kmph) temporarily reaching to 50 kmph during thunderstorm with dust rising surface winds. The maximum and minimum temperatures over Delhi are likely to be in the range of 38 to 40°C and 26 to 28°C respectively. The minimum temperature will be above normal up to 01 – 02°C, and the maximum temperature will be below normal up to 01 - 02°C. The predominant surface wind will likely be from the west direction with a wind speed of less than 10 kmph during the morning hours. The wind speed will gradually increase becoming 15-20 kmph from the west direction in the afternoon. It will decrease becoming less than 16 kmph from the southeast direction during evening and night on 22.05.2025.

3. Predicted maximum mixing depth is likely to be 4400 m on 19.05.2025, 4900 m on 20.05.2025, 5200 m on 21.05.2025 and 4800 m on 22.05.2025 over Delhi. Ventilation index is likely to be more than 30000 m2/s from 19.05.2025 to 22.05.2025 over Delhi. The ventilation index lower than 6000 m2/s with average wind speed less than 10 kmph is unfavourable for dispersion of pollutants.

4. The air quality is likely to be in the Moderate category on 19.05.2025. The air quality is likely to be in the Moderate category from 20.05.2025 to 22.05.2025. The outlook for the subsequent 6 Days: The air quality is likely to be in the Moderate to Poor category.

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

Air Quality Bulletin for Ahmedabad (19.05.2025)

1. The overall air quality of Ahmedabad was observed in the Satisfactory category with AQI 74 on 18.05.2025.

2. The air quality is likely to be in the Satisfactory category from 19.05.2025 to 21.05.2025.

Air Quality Bulletin for Mumbai (19.05.2025)

1. The overall air quality of Mumbai was observed in the Satisfactory category with AQI 74 on 18.05.2025.

2. The air quality is likely to be in the Satisfactory category from 19.05.2025 to 21.05.2025.

Air Quality Bulletin for Pune (19.05.2025)

1. The overall air quality of Pune was observed in the Satisfactory category with AQI 55 on 18.05.2025.

2. The air quality is likely to be in the Satisfactory category from 19.05.2025 to 21.05.2025.

Air Quality Index at Delhi

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Air Quality Index at Pune

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Air Quality Index at Mumbai

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Air Quality Index at Kolkata

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Air Quality Index at Bengaluru

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Air Quality Index at Lucknow

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Air Quality Index at Patna

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Air Quality Index at Hyderabad

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Air Quality Index at Ahmedabad

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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