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Delhi Logs Best September Air Quality in Five Years at AQI 102

Delhi recorded a monthly average AQI of 102 in September 2026, the lowest September reading in five years, with 194 days under AQI 200 so far this year.

By Published · 2 min read
Delhi Logs Best September Air Quality in Five Years at AQI 102 — GK24 title card

Why in News

On 30 September 2026 the Environment Ministry reported that Delhi averaged an AQI of 102 for September, its lowest September average in five years, along with the highest count of moderate days and the lowest count of poor to severe-plus days from January to September.

The Ministry of Environment, Forest and Climate Change reported on 30 September 2026 that Delhi has recorded its lowest monthly average Air Quality Index for September in five years. The comparison runs over the Septembers of 2022 to 2026, and the ministry reads the figures as a continuing improvement in the air of Delhi and the National Capital Region.

The September reading

Delhi averaged an AQI of 102 through September 2026. The same month stood at 105 in 2025, 105 in 2024, 108 in 2023 and 104 in 2022. An AQI in the low hundreds falls in the moderate band, so the improvement is one of degree rather than a move into clean air.

Days counted from January to September

Three counts for the nine months from January to September were placed alongside the monthly average.

Measure, January to September2026Best earlier year
Days with daily average AQI below 200 (moderate)194 days193 days in 2023
Days in the poor to severe-plus band79 days80 days in 2023
Average PM2.5 concentration69 microgram per cubic metre69 in 2025

The 194 moderate days are the highest in the five-year run, against 187 in 2025, 188 in 2024, 193 in 2023 and 146 in 2022. The 79 poor to severe-plus days are the fewest, against 86 in both 2025 and 2024, 80 in 2023 and 127 in 2022.

The particulate figure

Average PM2.5 for January to September, measured up to 28 September 2026, was 69 microgram per cubic metre. That ties the lowest in the period since 2022, since 2025 also gave 69, while 2024 stood at 81, 2023 at 73 and 2022 at 80. PM2.5 is the fine particulate matter of diameter up to 2.5 micrometre that lodges deep in the lungs, which is why it is tracked separately from the composite index.

Who does the work

The Commission for Air Quality Management, known as CAQM, is the statutory body for the National Capital Region and adjoining areas, and the ministry said it is working with the agencies concerned on prevention, control and abatement of air pollution. Those efforts are to be stepped up as the winter months arrive, when stubble burning and cold, still air usually push the index into the higher bands.

Important Facts

September 2026 average AQI in Delhi102, the lowest for September in five years
Earlier September averages105 in 2025, 105 in 2024, 108 in 2023, 104 in 2022
Days below AQI 200, January to September 2026194, the highest in five years
Poor to severe-plus days, January to September 202679, the lowest in five years
Average PM2.5, January to September 202669 microgram per cubic metre, up to 28 September
Body namedCommission for Air Quality Management (CAQM)
MinistryMinistry of Environment, Forest and Climate Change

Exam Point of View

Remember the headline number (AQI 102 for September 2026), the comparison years (2022 to 2026), the 194 days below AQI 200 from January to September, the 79 poor to severe-plus days, the PM2.5 average of 69 microgram per cubic metre and the body named in the release, the Commission for Air Quality Management.

Practice Questions

Q1.EnvironmentEasy

What monthly average Air Quality Index did Delhi record for September 2026, described as its lowest September figure in five years?

  1. A.92
  2. B.102
  3. C.112
  4. D.122
Show answer

Correct answer: B. 102

Explanation

The correct answer is 102. The Environment Ministry placed the September average for Delhi at 102, and set it against 105 in 2025, 105 in 2024, 108 in 2023 and 104 in 2022, which makes it the lowest September reading across those five years. Option A, 92, is wrong because the index did not fall that far; it would have put Delhi in a better band than the moderate one the reading actually sits in. Option C, 112, and option D, 122, are both higher than any of the five September averages named, so neither can be the lowest of the run. Candidates should note that a lowest-in-five-years claim always needs the comparison set, and here the whole set is worth carrying: 102 for the current year against 105, 105, 108 and 104 for the four years before it.

Q2.EnvironmentMedium

From January to September 2026, how many days did Delhi record with a daily average AQI below 200, the highest such count in five years?

  1. A.146 days
  2. B.187 days
  3. C.194 days
  4. D.214 days
Show answer

Correct answer: C. 194 days

Explanation

The correct answer is 194 days. A daily average below 200 falls in the moderate category, and the nine months of the current year gave 194 such days, the most in the five-year comparison. Option A, 146 days, is the figure for 2022, the weakest year of the set, and is a classic trap because it belongs to the same table. Option B, 187 days, is the figure for 2025, the year immediately before, and is the nearest wrong answer a candidate can pick by confusing the two most recent years; 2024 gave 188 days and 2023 gave 193 days. Option D, 214 days, does not appear in the comparison at all. Read together with the fall in bad-air days from 127 in 2022 to 79 this year, the direction of the trend is what the release is claiming, and the figure asked for is 194.

Q3.EnvironmentMedium

Which body did the Environment Ministry name as working with stakeholders on the prevention, control and abatement of air pollution in Delhi and the National Capital Region?

  1. A.Central Pollution Control Board
  2. B.Commission for Air Quality Management
  3. C.National Green Tribunal
  4. D.Indian Meteorological Department
Show answer

Correct answer: B. Commission for Air Quality Management

Explanation

The correct answer is the Commission for Air Quality Management, usually written as CAQM, which the ministry named as the body coordinating work with the agencies concerned. Option A, the Central Pollution Control Board, sets and enforces pollution standards across the country and runs the monitoring network, but it is not the coordinating commission for the capital region named here. Option C, the National Green Tribunal, is an adjudicating body that hears environmental cases and does not run pollution control programmes. Option D, the Indian Meteorological Department, forecasts weather and supplies the wind and temperature data that air quality forecasts rest on, which makes it a plausible distractor, but it is a weather agency rather than a pollution authority. Along with the numbers, examiners like to ask which body owns the air quality mandate for the capital region, and the answer is CAQM.

Frequently Asked Questions

What was the average AQI of Delhi in September 2026?

It was 102, the lowest monthly average for September in the five years from 2022 to 2026. September stood at 105 in 2025, 105 in 2024, 108 in 2023 and 104 in 2022.

How many moderate air days did Delhi have from January to September 2026?

There were 194 days with a daily average AQI below 200, the highest count in five years, against 193 days in 2023 and 146 days in 2022.

What was the PM2.5 level over those nine months?

The average was 69 microgram per cubic metre up to 28 September 2026, the joint lowest since 2022, matching the level of 2025.

Sources