 "What is Air Quality Index (AQI)")
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.
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Latest Updates on Air Quality Index
Delhi pollution curbs: Non-BS-VI vehicles barred from Nov 1, check rules
Delhi will bar non-BS-VI petrol and diesel vehicles registered outside the capital from November 1 to January 31, with exemptions for electric, CNG and specified essential vehicles
India eighth most polluted country in the world; Lahore most polluted city
Bhiwadi, located on the outskirts of Delhi, was ranked among the two most polluted cities in the world. Delhi followed it closely behind
 "India eighth most polluted country in the world; Lahore most polluted city")
39 Indian cities among world's 50 most polluted: Swiss firm report
The Swiss firm IQAir in its 'World Air Quality Report' released on Tuesday ranked India the world's eighth most polluted country in 2022, dropping from fifth place the previous year
 "39 Indian cities among world's 50 most polluted: Swiss firm report")
Kerala govt to install air quality monitoring devices at hospitals in Kochi
The Kerala government has decided to install air quality monitoring devices in select hospitals of the coastal city, which is reeling under toxic haze from the fire
 "Kerala govt to install air quality monitoring devices at hospitals in Kochi")
Stage-I of GRAP revoked as overall Air Quality Index of Delhi improves
In view of improvement in the overall AQI of Delhi and also considering the meteorological and weather forecasts, authorities decided to revoke the orders under Stage-I of GRAP
 "Stage-I of GRAP revoked as overall Air Quality Index of Delhi improves")
Delhi's AQI remains in 'very poor' category for third consecutive day
Both the major pollutants PM 2.5 and PM 10 were recorded at 304 in the very poor category and 183 at moderate category in the city on Monday morning
 "Delhi's AQI remains in 'very poor' category for third consecutive day")
CAQM invokes restriction under GRAP-II as Delhi's air quality deteriorates
GRAP is a set of anti-air pollution measures followed in the capital and its vicinity according to the severity of the situation
 "CAQM invokes restriction under GRAP-II as Delhi's air quality deteriorates")
Air quality worsening in India's cleanest city Indore, say experts
Indore has been selected by Clean Air Catalyst, a global alliance working to improve air quality, apart from Jakarta (Indonesia) and Nairobi (Kenya) for one of its projects
 "Air quality worsening in India's cleanest city Indore, say experts")
Strong surface winds forecast, min temperature at 8.6 deg Celsius in Delhi
On Tuesday, the AQI stood at 145 at 9 am, according to Central Pollution Control Board data; the relative humidity was recorded at 56 per cent
 "Strong surface winds forecast, min temperature at 8.6 deg Celsius in Delhi")
Delhi govt succeeds in identifying air pollution sources in real-time: CM
Chief Minister Arvind Kejriwal on Friday said the Delhi government's attempt to identify sources of air pollution on a real-time basis has started showing results.
 "Delhi govt succeeds in identifying air pollution sources in real-time: CM")
No 'good' days for Delhi air in Jan as winter makes pollution worse
Average monthly AQI at 'very poor' category, city eases graded action plan
 "No 'good' days for Delhi air in Jan as winter makes pollution worse")
Delhi records a minimum of 8.3 degrees Celsius; AQI remains 'moderate'
Delhi recorded a minimum temperature of 8.3 degrees Celsius, normal for this time of the year, on Thursday, the India Meteorological Department said
 "Delhi records a minimum of 8.3 degrees Celsius; AQI remains 'moderate'")
Delhi records minimum temperature of 8.6 degrees Celsius, AQI of 156
The weatherman has forecast strong surface winds during day time with the maximum temperature likely to settle around 20 degrees Celsius
 "Delhi records minimum temperature of 8.6 degrees Celsius, AQI of 156")
Rains in Delhi, maximum temperature dips to 5 degrees below normal: IMD
An AQI between 201 and 300 is considered "poor", 301 and 400 "very poor", and 401 and 500 "severe"
 "Rains in Delhi, maximum temperature dips to 5 degrees below normal: IMD")
Delhi records minimum temperature at 6.1 degree Celcius; air quality poor
Delhi recorded a minimum temperature of 6.1 degrees Celsius, three notches below the normal, the India Meteorological Department said on Saturday
 "Delhi records minimum temperature at 6.1 degree Celcius; air quality poor")
Even brief exposure to air pollution may impair brain function: Study
The researchers briefly exposed 25 healthy adults to diesel exhaust and filtered air at different times in a laboratory setting
 "Even brief exposure to air pollution may impair brain function: Study")
Delhi's AQI severe; forecasts predict immediate improvement, says CAQM
Delhi's 24-hour average air quality index (AQI) stood at 407 on Sunday, worsening from 294 on Saturday, amid calm winds
 "Delhi's AQI severe; forecasts predict immediate improvement, says CAQM")
Anti-pollution curbs under GRAP stage 3 lifted in Delhi as AQI improves
However, restrictions that were imposed under Stage-I and Stage-II of GRAP will continue
Explainer: What does an AQI of 450 mean? Is it just a winter thing?
At 450, the concentration of pollutants in the air "affects healthy people and seriously impacts those with existing diseases"
 "Explainer: What does an AQI of 450 mean? Is it just a winter thing?")
Air quality improves marginally in Delhi; AQI at 312 but smog persists
The improvement was slight but significant as the AQI was in the 'severe' category on Wednesday, at 421