The Ministry of Environment, Forest and Climate Change observed Swachh Vayu Diwas 2026 on 7 September — the International Day of Clean Air for Blue Skies — with Justice Prakash Shrivastava, Chairperson of the National Green Tribunal, as chief guest. The day carried three deliverables: the 5th Swachh Vayu Sarvekshan awards for the best-performing cities and, for the first time at national level, wards; a Compendium of Best Management Practices under the National Clean Air Programme; and a scorecard of what the programme has achieved since its 2017-18 base year.
For the CDS candidate this is a numbers-and-bodies topic. The numbers are below; the bodies — CPCB, NGT, CAQM, the State boards — and the laws that created them are the part most candidates skip and most questions test.
Where the day comes from
The United Nations General Assembly designated 7 September as the International Day of Clean Air for blue skies by resolution 74/212 of 19 December 2019; the first observance was in 2020. India marks it as Swachh Vayu Diwas. The tribunal chairperson's line — clean air is "a fundamental need rather than a luxury" — rests on a legal foundation: the Supreme Court has read the right to a clean environment into Article 21, while Article 48A and Article 51A(g) place the duty on the State and on the citizen respectively.
The programme: NCAP
The National Clean Air Programme was launched in January 2019 as a national, time-bound strategy for non-attainment cities — cities that had failed the National Ambient Air Quality Standards for five consecutive years. It now covers 130 cities in 24 States and Union Territories, each with a City Action Plan, and the States with their own plans. The original goal was a 20–30% cut in particulate matter by 2024 against 2017-18; it was revised to up to 40% reduction in PM10, or attainment of the national standard of 60 µg/m³, by 2025-26.
Money flows as performance-linked grants: ₹16,423.55 crore was released to the 130 cities between FY 2019-20 and FY 2025-26 — the release rounds it to ₹16,425 crore — of which cities report using ₹11,575.54 crore (70.5%). Part of that comes through the Fifteenth Finance Commission's grants for million-plus cities, which are also tied to air-quality performance.
The scorecard, FY 2025-26 against 2017-18:
| Achievement | Cities |
|---|---|
| Lower annual PM10 than the base year | 108 of 130 |
| Reduction above 20% | 72 |
| Reduction above 40% | 26 |
| Met the NAAQS annual standard | 14 |
Progress is tracked on PRANA — the Portal for Regulation of Air-pollution in Non-Attainment cities — which records the physical and financial status of every city plan and puts it in public view.
The Sarvekshan
Swachh Vayu Sarvekshan is the annual ranking of the NCAP cities, run by the ministry since 2022-23 on a framework that scores what a city has actually done about road dust, solid waste, vehicular emissions, industrial pollution, construction and demolition waste, other sources such as diesel generator sets, and public outreach. The process is a chain: self-assessment by the city, approval by a State-level Monitoring Committee, evaluation by the Central Pollution Control Board, field verification by independent committees, and selection of the best performers.
Cities compete in three population groups — above 10 lakh, 3 to 10 lakh and below 3 lakh. The 2025 edition's winners were Indore, Amravati and Dewas. The 2026 winners are Lucknow, Rourkela and Kalinganagar respectively. This year added a ward-level Sarvekshan across more than 7,400 wards, in three bands (above 30,000; 10,000–30,000; below 10,000 population): Ward 70 of Lucknow, Wards 30 and 36 of Bhubaneswar and Ward 13 of Rourkela led them, and 69 wards — three from each of 23 States and UTs — were also recognised. The ward award is a deliberate push towards the "whole of society" approach the NGT chairperson asked local bodies to adopt.
Measuring air: the network and the index
Standards mean nothing without measurement. The National Air Quality Monitoring Programme (NAMP), run by the CPCB, had 1,646 stations in 603 cities across 28 States and 7 UTs as of March 2026. Two kinds of station feed it: manual stations, which collect a 24-hour sample for laboratory analysis, and Continuous Ambient Air Quality Monitoring Stations (CAAQMS), which report PM2.5, PM10, SO2, NOx, CO, ozone and ammonia in real time. Industrial stacks are watched separately through Online Continuous Emission Monitoring Systems (OCEMS), mandatory for 17 categories of highly polluting industries, which transmit straight to CPCB servers. The SAMEER app gives citizens near real-time AQI for more than 292 cities.
The National Ambient Air Quality Standards were notified on 18 November 2009 for 12 pollutants — PM10, PM2.5, SO2, NO2, ozone, lead, CO, ammonia, benzene, benzo(a)pyrene, arsenic and nickel — with an annual limit of 60 µg/m³ for PM10 and 40 µg/m³ for PM2.5. The National Air Quality Index, developed by the CPCB with IIT Kanpur, was launched on 17 October 2014 as "one number, one colour, one description". It uses 8 pollutants — PM10, PM2.5, NO2, SO2, CO, O3, NH3 and lead — and the worst sub-index decides the AQI.
| AQI band | Range |
|---|---|
| Good | 0–50 |
| Satisfactory | 51–100 |
| Moderate | 101–200 |
| Poor | 201–300 |
| Very Poor | 301–400 |
| Severe | 401–500 |
The physics behind the fuss is size: a human hair is about 100 micrometres wide; PM2.5 particles, at 2.5 micrometres or less, are small enough to cross from the lungs into the bloodstream. The atmosphere notes on the troposphere explain why winter inversions trap them close to the ground.
The legal architecture
- Water (Prevention and Control of Pollution) Act, 1974 — created the Central Pollution Control Board and the State boards.
- Air (Prevention and Control of Pollution) Act, 1981 — gave those boards their air-quality mandate; it followed the 1972 Stockholm Conference.
- Environment (Protection) Act, 1986 — the umbrella law after Bhopal, under which industrial emission standards and the general standards in the Environment (Protection) Rules, 1986 are notified.
- National Green Tribunal Act, 2010 — the specialised tribunal whose chairperson was the day's chief guest.
- Commission for Air Quality Management in NCR and Adjoining Areas Act, 2021 — created CAQM, the statutory body for Delhi-NCR and the adjoining areas of Haryana, Punjab, Rajasthan and Uttar Pradesh, first set up by ordinance in October 2020.
CPCB and CAQM are statutory, not constitutional, bodies — a distinction the statutory commissions page drills.
Sector measures worth remembering
The release lists the levers, and each is a potential one-liner. Vehicles: BS-VI fuel and vehicles nationwide since April 2020; PM E-DRIVE (Heavy Industries) and PM e-Bus Sewa (Housing and Urban Affairs) for electric mobility; the Vehicle Scrapping Policy with Registered Vehicle Scrapping Facilities and Automated Testing Stations; MoHUA's PARIVARTAN scheme to replace BS-IV and older trucks and buses in the NCR; CAQM's order that only BS-VI, CNG or electric buses may enter Delhi from 1 November 2026, and that new three-wheelers in Delhi be electric. Industry: CPCB has classified 419 sectors into 125 Red, 137 Orange, 94 Green, 54 White and 9 Blue categories by pollution potential; a 50 mg/Nm³ particulate norm for large NCR industries applies from 1 October 2026; CPCB IV+ emission norms for diesel gensets up to 800 kW were notified in 2022; industrial clusters are graded as Critically or Severely Polluted Areas on the CEPI index. Dust: anti-smog guns at construction sites above 20,000 sq m; 70 Dust Control and Management Cells across the NCR. The conservation side of the syllabus, on the Indian geography conservation page, connects greening and wetlands to the same goal.
🔑 Revision block
The day. 7 September — International Day of Clean Air for Blue Skies (UNGA 74/212, 2019; first observed 2020); Swachh Vayu Diwas in India; 2026 chief guest NGT Chairperson Justice Prakash Shrivastava. NCAP. January 2019; 130 cities, 24 States/UTs; base year 2017-18; target 40% PM10 cut or NAAQS by 2025-26; ₹16,423.55 crore released, 70.5% used; PRANA portal. Scorecard. 108 cities improved; 72 above 20%; 26 above 40%; 14 met NAAQS. Sarvekshan 2026. Lucknow, Rourkela, Kalinganagar; wards — Lucknow 70, Bhubaneswar 30 & 36, Rourkela 13; 7,400+ wards assessed. 2025 — Indore, Amravati, Dewas. Standards. NAAQS 18 November 2009, 12 pollutants, PM10 60 / PM2.5 40 µg/m³ annual; AQI 17 October 2014, 8 pollutants, 6 bands, worst sub-index rules. Network. NAMP 1,646 stations, 603 cities; CAAQMS real-time; OCEMS for 17 industry categories; SAMEER app 292+ cities. Laws and bodies. Water Act 1974 (CPCB), Air Act 1981, EPA 1986, NGT Act 2010, CAQM Act 2021. Levers. BS-VI April 2020; 419 sectors — 125 Red/137 Orange/94 Green/54 White/9 Blue; 50 mg/Nm³ from 1 October 2026; only BS-VI/CNG/EV buses into Delhi from 1 November 2026.
🎯 Practice MCQs
Q1. The International Day of Clean Air for Blue Skies is observed on: (a) 5 June (b) 7 September (c) 16 September (d) 2 December → (b).
Q2. NCAP was launched in: (a) 2015 (b) 2017 (c) 2019 (d) 2021 → (c).
Q3. NCAP's revised target is a PM10 reduction of up to: (a) 20% by 2024 (b) 30% by 2024 (c) 40% by 2025-26 (d) 50% by 2030 → (c) — against 2017-18 levels.
Q4. The National Ambient Air Quality Standards, 2009 cover how many pollutants? (a) 6 (b) 8 (c) 10 (d) 12 → (d).
Q5. India's AQI is computed from how many pollutants? (a) 6 (b) 8 (c) 10 (d) 12 → (b).
Q6. An AQI value of 350 falls in the category: (a) Poor (b) Very Poor (c) Severe (d) Moderate → (b) — 301–400.
Q7. PRANA is a portal for: (a) forest cover mapping (b) tracking NCAP implementation in non-attainment cities (c) river water quality (d) Ramsar sites → (b).
Q8. Which city topped the 2026 Swachh Vayu Sarvekshan in the above-10-lakh category? (a) Indore (b) Surat (c) Lucknow (d) Rourkela → (c).
Q9. The Central Pollution Control Board was created under the: (a) Air Act, 1981 (b) Water Act, 1974 (c) Environment (Protection) Act, 1986 (d) NGT Act, 2010 → (b).
Q10. The Commission for Air Quality Management covers the NCR and adjoining areas of all the following States EXCEPT: (a) Punjab (b) Haryana (c) Madhya Pradesh (d) Rajasthan → (c).
Q11. BS-VI emission norms were applied across India from: (a) April 2017 (b) April 2018 (c) April 2020 (d) April 2023 → (c).
Q12. Consider the following: 1. Under NCAP, 14 cities met the NAAQS annual standard in 2025-26. 2. The NAAQS annual limit for PM10 is 40 µg/m³. (a) 1 only (b) 2 only (c) Both (d) Neither → (a) — 60 µg/m³ is the PM10 limit; 40 is for PM2.5.
📋 How this gets asked (PYQ pattern)
Air-quality questions come in four shapes. The date item — the clean-air day, NCAP's launch year, or the AQI launch. The count item — 12 pollutants in NAAQS against 8 in the AQI, or six AQI bands. The body item — which Act created CPCB, whether NGT or CAQM is statutory, which States fall under CAQM. The ranking item — Sarvekshan winners, usually the top city in the largest category.
The fresh 2026 hook is the 5th Sarvekshan with Lucknow on top and the 108/72/26/14 scorecard, likeliest to appear as a statement pair on NCAP's target and base year. We describe the recurring pattern, not any exact past question.
Preparing for CDS or OTA? Environment questions are won on bodies and numbers, and this topic has both. Build the base with our CDS/OTA geography hub, follow the daily CDS/OTA current affairs, and prepare with our faculty in the upcoming Cavalier courses in Delhi.
✍️ Written by Aditya Tiwari — Polity, environment & governance faculty at The Cavalier. Reviewed by the Cavalier Faculty Desk. The Cavalier, founded by ex-Army officers, has trained NDA/CDS/SSB aspirants since 2001 (Facebook · YouTube).
Source: PIB / Ministry of Environment, Forest and Climate Change, 7 September 2026 (Swachh Vayu Diwas release and the "India's Path to Blue Skies" backgrounder). Standards, index and legal history cross-verified with CPCB and UN sources.