Air Quality Early Warning System For Delhi

Bulletin & Message

Air Quality and Weather Bulletin for Delhi (18.04.2026)

दिल्लीकेलिएवायुगुणवत्ताऔरमौसमबुलेटिन (18.04.2026)

1. Past Weather and Air Quality Observation: The air quality over Delhi was in Poor category with CPCB AQI 263 at 4 PM on 17.04.2026. There has been no large change in maximum temperatures and fall in minimum temperatures up to 3-5°C during past 24 hours over Delhi. The minimum temperatures are in the range of 20-21°C and maximum temperatures were in the range of 39-41°C during past 24 hours over Delhi. The minimum temperatures are below normal (-1.6°C to -3.0°C) at most places and normal (-1.5°C to 1.5°C) at remaining parts over Delhi. The maximum temperatures were appreciably above normal (3.1°C to 5.0°C) at few places and above normal (1.6°C to 3.0°C) over remaining parts of Delhi. During the past 24 hours, Moderate to light rain was observed at most places across Delhi. Partly cloudy sky with surface wind speeds up to 20 kmph prevailed gusting to 72 kmph from southeast direction over Delhi during past 24 hours. Mainly clear sky with surface wind speeds up to 15 kmph likely to prevailed from west direction over the region in the forenoon today.

2. Mainly clear sky becoming partly cloudy sky with possibility of thundery development towards afternoon to evening. The maximum temperature over Delhi is likely to be in the range of 37°C to 39°C. The maximum temperature will be above normal (1.6°C to 3.0°C) over Delhi. The predominant surface wind is likely to be from west direction reaching up to 15 kmph during the afternoon. The wind speed will gradually decrease reaching up to 12 kmph from northwest direction during evening and night on 18.04.2026. Mainly clear sky becoming partly cloudy sky. The maximum and minimum temperatures over Delhi are likely to be in the ranges of 39°C to 41°C and 22°C to 24°C respectively. The minimum temperature will be above normal (1.6°C to 3.0°C) at most places and the maximum temperature will be above normal (1.6°C to 3.0°C) at most places over Delhi. The predominant surface wind is likely to be from the northwest direction with wind speed reaching up to 10 kmph during the morning hours. The wind speed will increase becoming less than 15 kmph from northwest direction during the afternoon. The wind speed will decrease becoming up to 12 kmph from the northwest direction during evening and night on 19.04.2026. Mainly clear sky becoming partly cloudy sky. The maximum and minimum temperatures in Delhi are likely to be in the ranges of 38°C to 40°C and 20°C to 22°C respectively. The minimum temperatures will be near normal (-1.5°C to 1.5°C) and the maximum temperatures will be above normal (1.6°C to 3.0°C) over Delhi. The predominant surface wind is likely to be from the northwest direction associated with wind speed reaching up to 10 kmph during the morning hours. The wind speed will be increase reaching up to 15 kmph from west direction during afternoon hours. The wind speed will decrease becoming up to 12 kmph from the northwest direction during evening and night on 20.04.2026. Mainly clear sky. The maximum and minimum temperatures in Delhi are likely to be in the ranges of 39°C to 41°C and 20°C to 22°C respectively. The minimum temperatures will be near normal (-1.5°C to 1.5°C) and the maximum temperatures will be above normal (1.6°C to 3.0°C) at most places over Delhi. The predominant surface wind is likely to be from the northwest direction associated with wind speed reaching up to 15 kmph during the morning hours. The predominant surface wind will increase reaching up to 20 kmph from northwest direction during afternoon hours. The predominant surface wind will decrease reaching up to 15 kmph northwest direction during evening and night on 21.04.2026.

3. Predicted maximum mixing depth is likely to be 4500m on 18.04.2026, 4450m on 19.04.2026, 4200m on 20.04.2026, and 4450m on 21.04.2026 over Delhi. Ventilation index is likely to be above 25000m2/s on 18.04.2026, 27000m2/s on 19.04.2026, 21000m2/s on 20.04.2026 and above 30000m2/s on 21.04.2026 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 18.04.2026. The air quality is likely to be in the Moderate category from 19.04.2026 to 20.04.2026. The air quality is likely to be in the Poor category on 21.04.2026. The outlook for the subsequent 6 Days: The air quality is likely to be in the Poor to Moderate category.

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

Air Quality Bulletin for Ahmedabad (18.04.2026)

1. The overall air quality of Ahmedabad was observed in the Moderate category with AQI 116 on 17.04.2026.

2. The air quality is likely to be in the Moderate category 18.04.2026 to 20.04.2026.

Air Quality Bulletin for Mumbai (18.04.2026)

1. The overall air quality of Mumbai was observed in the Satisfactory category with AQI 68 on 17.04.2026.

2. The air quality is likely to be in the Satisfactory category from 18.04.2026 to 20.04.2026.

Air Quality Bulletin for Pune (18.04.2026)

1. The overall air quality of Pune was observed in the Satisfactory category with AQI 71 on 17.04.2026.

2. The air quality is likely to be in the Satisfactory category on 18.04.2026 and Moderate category from 19.04.2026 to 20.04.2026.

Air Quality Index at Delhi

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Forecast

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