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What is Air Quality Index (AQI)

Air Quality Index

About Air Quality Index

What is Air Quality Index (AQI)

The air quality index (AQI) is an index for reporting air quality on a daily basis. It is a measure of how air pollution affects one's health within a short time period. The purpose of the AQI is to help people know how the local air quality impacts their health. The Environmental Protection Agency (EPA) calculates the AQI for five major air pollutants, for which national air quality standards have been established to safeguard public health.

 
1. Ground-level ozone
2. Particle pollution/particulate matter (PM2.5/pm 10)
3. Carbon Monoxide
4. Sulfur dioxide
5. Nitrogen dioxide
 
The higher the AQI value, the greater the level of
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Latest Updates on Air Quality Index

Delhi weather: IMD issues orange alert for heavy rainfall; AQI improves

In its advisory, the IMD warned of a moderate thunderstorm, cautioning against intense lightning in open areas, potential traffic snarls, and possible delays to flights and trains

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Updated On : 18 Jun 2025 | 10:14 AM IST

Yellow alert issued in Delhi, IMD forecasts moderate rainfall till June 19

IMD has issued a yellow alert for Delhi till June 19, warning of thunderstorms, lightning and winds up to 50-60 kmph, with light to moderate rain likely during the early hours

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Updated On : 16 Jun 2025 | 8:56 AM IST

IMD forecasts soaring temperatures as Delhi's AQI dips into poor zone

Delhi weather update: Residents in the capital woke up to hot and humid conditions on Monday, with temperatures likely to hit 42 degrees Celsius and minimums staying around 28 degrees Celsius

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Updated On : 09 Jun 2025 | 7:52 AM IST

Delhi breathed better in 2025 compared to 2024: Environment Minister Sirsa

Sirsa said the data reveal that the average AQI during these five months stood at 214, an improvement from 231 recorded during the same period in 2024

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Updated On : 05 Jun 2025 | 6:55 AM IST

CAQM mandates only CNG, electric vehicles for e-commerce fleets in NCR

From January 2026, no petrol or diesel vehicles can be added to aggregator fleets in NCR, with CAQM pushing for faster transition to clean mobility options

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Updated On : 04 Jun 2025 | 10:30 PM IST

Delhi cabinet clears sanitation, dust plan to cut road pollution: CM

She said under this initiative, a range of equipment will be deployed on PWD-maintained roads to combat dust pollution. They include 250 water sprinkler machines integrated with anti-smog guns

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Updated On : 20 May 2025 | 11:07 PM IST

Delhi weather: IMD predicts rain, thunderstorms for today, AQI drops to 195

Over the past week, light rain and thunderstorms have brought a slight drop in the maximum temperature

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Updated On : 20 May 2025 | 7:54 AM IST

IMD issues yellow alert for rain in Delhi today, AQI improves to 136

Thunderstorms and rainfall are likely to continue across Delhi till May 25, while air quality has improved to the 'moderate' category after a dust storm in the region

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Updated On : 18 May 2025 | 9:51 AM IST

Delhi-NCR air quality improves to 'poor', AQI drops to 298 post dust storm

Delhi-NCR air quality improves to 'poor' with AQI at 298 after dust storm, though areas like Anand Vihar Ashok Vihar and Aya Nagar continue to report 'very poor' levels

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Updated On : 16 May 2025 | 11:38 AM IST

AAP-BJP spar over worsening air quality after dust storm batters Delhi

A sudden dust storm from Rajasthan engulfed Delhi, pushing air quality into the 'poor' zone and igniting a sharp political blame game between AAP and BJP

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Updated On : 15 May 2025 | 10:59 PM IST

Cloudy skies, thunderstorms likely in Delhi today, AQI rises to 236

The maximum temperature shall remain around 40 degrees Celsius while the minimum temperature is likely to settle around 23 degrees Celsius

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Updated On : 15 May 2025 | 8:50 AM IST

Delhi weather update: Rain, thunderstorms expected today, AQI at 131

Strong surface winds reaching speeds of 30-40 kmph are also expected

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Updated On : 12 May 2025 | 7:25 AM IST

IMD issues yellow alert for rain, thunderstorms in Delhi today, AQI at 173

Residents can expect relief from the heat until May 12, with thunderstorms, rainfall, and a dip in maximum temperatures forecast

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Updated On : 11 May 2025 | 7:22 AM IST

Delhi weather: IMD forecasts rain, storms; yellow alert issued today

Residents can expect relief from the heat until May 11, with thunderstorms, rainfall and a dip in maximum temperatures forecast

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Updated On : 09 May 2025 | 8:20 AM IST

IMD issues orange alert for rain in Delhi today, AQI improves to 164

Residents can expect relief from the heat between May 5 and 11, with thunderstorms, rainfall, and a dip in maximum temperatures on the forecast

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Updated On : 05 May 2025 | 7:19 AM IST

IMD issues yellow alert for rain, thunderstorms in Delhi today; AQI at 206

Residents can expect relief from the heat between May 5 and 11, with thunderstorms, rainfall, and a dip in maximum temperatures on the forecast

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Updated On : 04 May 2025 | 8:15 AM IST

Delhi to witness relief from intense heat as IMD predicts rain, AQI at 251

Light rain is predicted for the national capital on April 29, bringing some respite to residents

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Updated On : 28 Apr 2025 | 8:09 AM IST

Delhi braces for heatwave as temperature set to rise, AQI remains poor

The IMD has forecast a maximum temperature of 41 degrees Celsius and a minimum of 20 degrees Celsius for today

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Updated On : 25 Apr 2025 | 8:20 AM IST

Delhi braces for warmer days as mercury set to rise, AQI turns 'poor'

Temperatures are likely to remain between 40 degrees Celsius and 42 degrees Celsius over the next few days

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Updated On : 23 Apr 2025 | 8:09 AM IST

Manjinder Sirsa orders crackdown on polluters amid worsening air in Delhi

Chairing an emergency review meeting with senior officials of the Environment Department and the Delhi Pollution Control Committee (DPCC), he expressed concern over the rising AQI levels

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Updated On : 22 Apr 2025 | 9:21 AM IST