Air Quality Early Warning System For Delhi

Bulletin & Message

Air Quality and Weather Bulletin for Delhi (19.07.2025)

दिल्लीकेलिएवायुगुणवत्ताऔरमौसमबुलेटिन (19.07.2025)

1. Past Weather and Air Quality Observation: The air quality over Delhi was in Satisfactory category with CPCB AQI 60 at 4 PM on 18.07.2025. There has been rise in the minimum temperature up to 1 to 2°C and no significance changes in maximum temperature over Delhi/NCR during the past 24 hours. The maximum and minimum temperatures over Delhi were around 32 to 34°C and 24 to 26°C respectively. The minimum temperature was below normal up to 1 to 2°C and the maximum temperature was below normal up to 1 to 2°C. Generally cloudy sky conditions with predominant surface wind from the northeast direction with wind speeds up to 20 kmph with gusting wind 35 kmph prevailed during the past 24 hours. Very light to light rainfall has been recorded in most places over Delhi. Partly cloudy sky conditions with a windspeed of less than 18 kmph from the southeast direction prevailed over the region in the forenoon today.

2. Partly cloudy sky. Very light to light rain accompanied with thunderstorms/lightning. Occasionally strong surface winds 20 - 30 kmph. The maximum temperatures over Delhi are likely to be in the range of 34 to 36°C. The maximum temperature will be near normal. The predominant surface wind will likely be from the southeast direction with a wind speed of less than 15 kmph in the afternoon. The wind speed will gradually decrease becoming 10-15 kmph from the southwest direction during evening and night on 19.07.2025. Partly cloudy sky. Very light rain. The maximum and minimum temperatures over Delhi are likely to be in the range of 35 to 37°C and 25 to 27°C respectively. The minimum temperature will be below normal up to 1 to 2°C, and the maximum temperature will be above normal up to 1 to 2°C. The predominant surface wind will likely be from the southwest direction with a wind speed of less than 12 kmph during the morning hours. The wind speed will gradually increase becoming less than16 kmph from the west direction in the afternoon. It will decrease becoming less than 12 kmph from the west direction during the evening and night on 20.07.2025. Generally cloudy sky. Very light to light rain accompanied with thunderstorms/lightning. The maximum and minimum temperatures over Delhi are likely to be in the range of 32 to 34°C and 26 to 28°C respectively. The minimum temperature will be near normal and the maximum temperature will be below normal up to 1 to 2°C. The predominant surface wind will likely be from the southwest direction with a wind speed of less than 25 kmph during the morning hours. The wind speed will gradually decrease becoming less than 15 kmph from the south direction in the afternoon. It will increase becoming less than 18 kmph from the southwest direction during the evening and night on 21.07.2025. Generally cloudy sky. Very light to light rain accompanied with thunderstorms/lightning. The maximum and minimum temperatures over Delhi are likely to be in the range of 31 to 33°C and 24 to 26°C respectively. The minimum temperature will be below normal up to 1 to 2°C and the maximum temperature will be below normal up to 1 to 3°C. The predominant surface wind will likely be from the southwest direction with a wind speed of less than 10 kmph during the morning hours. The wind speed will gradually increase becoming less than 15 kmph from the west direction in the afternoon. It will decrease becoming less than 10 kmph from the west direction during the evening and night on 22.07.2025.

3. Predicted maximum mixing depth is likely to be 1600 m on 19.07.2025, 2300 m on 20.07.2025, 1300 m on 21.07.2025, and 500 m on 22.07.2025 over Delhi. Ventilation index is likely to be 11000 m2/s on 19.07.2025, 11000 m2/s on 20.07.2025, 6000 m2/s on 21.07.2025 and 3000 m2/s on 22.07.2025 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 Satisfactory category on 19.07.2025. The air quality is likely to be in the Satisfactory category from 20.07.2025 to 22.07.2025. The outlook for the subsequent 6 Days: The air quality is likely to be in the Satisfactory to Moderate category.

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

Air Quality Bulletin for Ahmedabad (19.07.2025)

1. The overall air quality of Ahmedabad was observed in the Satisfactory category with AQI 87 on 18.07.2025.

2. The air quality is likely to be in the Satisfactory category from 19.07.2025 to 21.07.2025.

Air Quality Bulletin for Mumbai (19.07.2025)

1. The overall air quality of Mumbai was observed in the Satisfactory category with AQI 65 on 18.07.2025.

2. The air quality is likely to be in the Satisfactory category from 19.07.2025 to 21.07.2025.

Air Quality Bulletin for Pune (19.07.2025)

1. The overall air quality of Pune was observed in the Satisfactory category with AQI 69 on 18.07.2025.

2. The air quality is likely to be in the Satisfactory category from 19.07.2025 to 21.07.2025.

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