Air Quality Early Warning System For Delhi

Bulletin & Message

Air Quality and Weather Bulletin for Delhi (15.05.2026)

दिल्ली के लिए वायु गुणवत्ता और मौसम बुलेटिन (15.05.2026)

1. Past Weather and Air Quality Observation: The air quality over Delhi was in Moderate category with CPCB AQI 154 at 4 PM on 14.05.2026. Very Light Rain/Drizzle occurred at isolated places over Delhi. There has been a slight rise in maximum temperatures by 1-2°C and a fall in minimum temperatures by 2-5°C during the past 24 hours over Delhi. The maximum temperatures were in the range of 39-41°C, and the minimum temperatures were in the range of 24-26°C, respectively, over the past 24 hours in Delhi. The minimum temperatures are below normal (-1.6°C to -3.0°C) at a few places, above normal (1.6°C to 3.0°C) at isolated places, and normal (-1.5°C to 1.5°C) at the remaining parts over Delhi. The maximum temperatures are normal (-1.5°C to 1.5°C) at most places over Delhi. Mainly clear sky with surface wind speeds up to 20 kmph gusting to 48 kmph from the southwest direction over Delhi during the past 24 hours. Mainly clear sky with surface wind speeds up to 14 kmph is likely to prevail from the west-southwest direction over the region in the forenoon today.

2. Mainly clear sky becoming partly cloudy sky towards afternoon/evening. Possibility of thundery development towards evening/night. The maximum temperatures over Delhi are likely to be in the range of 40°C to 42°C. The maximum temperatures will be above normal (1.5°C to 3.0°C) at most places over Delhi. The predominant surface wind is likely to be from the northwest direction with surface wind speed reaching up to 15 kmph during the afternoon hours. The wind speed will decrease up to 10 kmph from the north direction during the evening and night on 15.05.2026. Mainly clear sky. The maximum and minimum temperatures over Delhi are likely to be in the range of 40°C to 42°C and 23°C to 25°C, respectively. The minimum temperature will be below normal (1.5°C to 3.0°C) at most places, and maximum temperatures will be near normal (-1.5°C to 1.5°C) at most places over Delhi. The predominant surface wind is likely to be from the northeast direction with surface 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 be up to 15 kmph from the northwest direction during the evening and night on 16.05.2026. Mainly clear sky. Strong surface winds speed 20-30 kmph occasionally gusting to 40 kmph during the day. The maximum and minimum temperatures over Delhi are likely to be in the range of 41°C to 43°C and 24°C to 26°C, respectively. The minimum temperature will be below normal (1.5°C to 3.0°C) at most places, and maximum temperatures will be above normal (1.5°C to 3.0°C) at most places over Delhi. The predominant surface wind is likely to be from the northwest direction with wind reaching up to 15 kmph during the morning hours. The surface wind speed will increase, reaching up to 25 kmph from the northwest direction during the afternoon. The wind speed will be up to 25 kmph from the northwest direction during the evening and night on 17.05.2026. Mainly clear sky. Strong surface winds speed 20-30 kmph occasionally gusting to 40 kmph during the day. The maximum and minimum temperatures over Delhi are likely to be in the range of 42°C to 44°C and 25°C to 27°C, respectively. The minimum temperature will be near normal (-1.5°C to 1.5°C) at most places, and the maximum temperature will be appreciably above normal 3.1°C to 5.0°C) over Delhi. The predominant surface wind is likely to be from the west direction with wind reaching up to 30 kmph during the morning hours. The surface wind speed will be up to 30 kmph from the west direction during the afternoon. The surface wind speed will be less than 25 kmph from the west direction during the evening and night on 18.05.2026.

3. Predicted maximum mixing depth is likely to be 4700m on 15.05.2026, 5300m on 16.05.2026, 5200m on 17.05.2026, and 4400m on 18.05.2026 over Delhi. Ventilation index is likely to be more than 30000m2/s on 15.05.2026, 30000m2/s on 16.05.2026, 30000m2/s on 17.05.2026, and 30000m2/s on 18.05.2026 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 15.05.2026. The air quality is likely to be in the Moderate category from 16.05.2026 to 17.05.2026. The air quality is likely to be in the Poor category on 18.05.2026. The outlook for the subsequent 6 Days: The air quality is likely to be in the Moderate to Poor.

Air quality forecasts for 140 other Indian cities are available at: https://nwp.imd.gov.in/airqualityfc_bulletin_mausam.php.
For further information, please contact the Environment Monitoring and Research Center (EMRC), India Meteorological Department (IMD), Ministry of Earth Sciences (MoES) at emrc.imdhq@imd.gov.in

Air Quality Index at Delhi

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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