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How to read the National Air Quality Index (AQI) and take action

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Learn what AQI numbers really mean for your health, how the CPCB calculates pollution, and the steps you can take when air quality hits hazardous levels in your city.

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#National Air Quality Index India#CPCB SAMEER app#AQI 250 meaning#PM2.5 health impact India#report air pollution India#National Clean Air Programme RTI#Air Act 1981 India#NGT environmental complaint

The grey haze is real

You wake up in Delhi, Mumbai, or Bengaluru, and the sky looks like a low-budget dystopian movie filter. Your weather app says the AQI is 250. Is that "just a bit dusty" or "stay inside and wear an N95" territory? Most of us check the AQI like we check Instagram—scrolling past the numbers without knowing what they actually do to our lungs. Whether it is construction dust from the new metro line or seasonal stubble burning, understanding these numbers is the first step to not just surviving the smog, but holding local authorities accountable for the air you breathe.

What the law and the CPCB actually say

In India, air quality is monitored by the Central Pollution Control Board (CPCB) under the Air (Prevention and Control of Pollution) Act, 1981. In 2014, the Government of India launched the National Air Quality Index (AQI) with the tagline "One Number-One Colour-One Description" to make it easier for you to understand what is happening outside.

The AQI is calculated based on eight major pollutants: Particulate Matter (PM10 and PM2.5), Nitrogen Dioxide (NO2), Sulphur Dioxide (SO2), Carbon Monoxide (CO), Ozone (O3), Ammonia (NH3), and Lead (Pb). For a daily AQI to be recorded, data for at least three pollutants (one of which must be PM10 or PM2.5) must be available for 24 hours.

What AQI 250 actually means

When you see a reading of 250, you are in the "Poor" category (which ranges from 201 to 300). According to the CPCB's official classification, this level causes "breathing discomfort to most people on prolonged exposure." It is not just an annoyance; it is a health risk.

Here is how the CPCB buckets the air you breathe:

  • 0–50 (Good): Minimal impact.
  • 51–100 (Satisfactory): May cause minor breathing discomfort to sensitive people.
  • 101–200 (Moderate): May cause breathing discomfort to people with lung disease like asthma, and discomfort to children and elderly.
  • 201–300 (Poor): Breathing discomfort to most people on prolonged exposure.
  • 301–400 (Very Poor): May cause respiratory illness on prolonged exposure.
  • 401–500 (Severe): Affects healthy people and seriously impacts those with existing diseases.

Legally, if the AQI stays in the "Poor" or "Very Poor" range, specific emergency measures kick in. In the National Capital Region (NCR), this is called the Graded Response Action Plan (GRAP). Under the Environment (Protection) Act, 1986, the government can legally shut down industries, stop construction, and even restrict vehicle movement (like the Odd-Even scheme) based on these numbers.

Your playbook for checking air and taking action

Don't just complain about the smog on X (formerly Twitter). Use these steps to verify the data and report violations.

1. Get the official data (Stop relying on third-party apps)

Third-party apps often use proprietary algorithms or uncalibrated low-cost sensors. For data that holds up in a legal complaint, use the CPCB’s official sources.

  • What to do: Download the SAMEER App (the official app of the CPCB) or visit the CPCB's National Air Quality Index portal.
  • What to look for: Check the "Prominent Pollutant." If it is PM2.5, that is fine dust that enters your bloodstream. If it is O3 (Ozone), it is usually a result of traffic fumes reacting with sunlight.

2. Identify the local culprit

AQI 250 is often caused by a mix of city-wide pollution and hyper-local sources. If your street is noticeably worse than the city average, look for:

  • Construction sites: Are they using green nets? Is the debris covered? Under the Construction and Demolition Waste Management Rules, 2016, they are legally required to suppress dust.
  • Waste burning: Burning plastic or municipal waste is illegal under the Solid Waste Management Rules, 2016 and the Plastic Waste Management Rules, 2016.
  • Industrial chimneys: Look for thick, black smoke during odd hours.

3. File a formal complaint via SAMEER

The SAMEER app isn't just for viewing data; it is a reporting tool.

  • Step-by-step: Open the app > Click on 'Complaints' > Register yourself > Upload a photo of the violation (e.g., a burning trash pile) > Tag the location.
  • Timeline: The app is supposed to route the complaint to the relevant Urban Local Body (ULB) or the State Pollution Control Board (SPCB). You should receive an acknowledgement number immediately.
  • If it fails: If the complaint is marked "Resolved" but the smoke is still there, take a screenshot and move to Step 4.

4. Use RTI to track the "National Clean Air Programme" (NCAP)

India has a massive budget under the NCAP to reduce pollution by 20-30% in 131 cities. If your city's air hasn't improved, ask where the money went. You can File an RTI online to your local Municipal Corporation.

  • What to ask: "Provide the total funds received under NCAP for the financial year 2024-25 and the item-wise expenditure on mechanical street sweepers, smog towers, and plantation drives."
  • Why this works: It puts pressure on officials who are sitting on unused environmental budgets.

5. Report environmental crimes to the Police

While the SPCB handles industrial pollution, "public nuisance" and illegal burning can be reported to the police. If someone is burning toxic waste near your home, you can technically How to file an FIR (and what to do if police refuse) under Section 270 of the Bharatiya Nyaya Sanhita (BNS) (previously Section 278 of the IPC), which deals with making the atmosphere noxious to health.

6. Escalate to the National Green Tribunal (NGT)

If local authorities are ignoring a massive pollution source (like a factory or a faulty landfill), the NGT is your best bet. Under Section 14 of the National Green Tribunal Act, 2010, the tribunal has the jurisdiction to decide all civil cases where a substantial question relating to the environment is involved.

  • What to do: You don't always need a lawyer for the initial application. You can send a letter-petition to the NGT Registrar (check greentribunal.gov.in for the address of your zonal bench—Delhi, Bhopal, Pune, Kolkata, or Chennai).

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Where it usually breaks

Even with the law on your side, the system often stalls. Here are the most common ways your attempt to take action might hit a wall, and how to jump over it.

1. The "Not My Jurisdiction" Shuffle

When you report a local pollution source—like a neighbour burning plastic or a construction site spewing dust—the police might tell you to call the Municipality (MCD/BMC/BBMP). The Municipality might tell you it’s a matter for the State Pollution Control Board (SPCB).

  • The Workaround: Don't play phone tag. File a formal complaint on the CPCB’s SAMEER app first. This creates a digital trail that is harder to ignore. If you are calling, mention specifically that the violation falls under the Solid Waste Management Rules, 2016 (for burning) or the Construction and Demolition Waste Management Rules, 2016. Naming the specific law usually makes officers take you more seriously.

2. The SAMEER App "No Data" Glitch

Sometimes the official app shows "No Data Available" for your nearest station, or the app simply crashes.

  • The Workaround: Use the CPCB’s web portal as a backup. If a specific sensor is consistently down, it is likely a maintenance issue. File an RTI (Right to Information) query to the SPCB asking for the "downtime logs and maintenance schedule" for that specific station ID. Nothing scares a department like a request for maintenance logs.

3. The "Private Property" Excuse

If you report dust from a massive private housing project, guards might try to stop you from taking photos or claim you have no right to question what happens inside their gates.

  • The Workaround: You don't need to enter the property. Document the dust clouds or smoke from the public road. Under the Air Act, 1981, pollution doesn't stop at a property line. If the dust is crossing into public space, it is a violation. Use your phone to record a video that shows the source (the site) and the impact (the dust on the street/trees).

4. The "Temporary" Violation

By the time an inspector arrives (usually 48–72 hours later), the waste pile has finished burning or the construction site has turned off the machines.

  • The Workaround: Always timestamp your evidence. Use a "GPS Camera" app that overlays the exact coordinates, date, and time on your photos. When filing your complaint, explicitly state: "Evidence of violation at [Time] on [Date] is attached. I request an inspection of the residual ash/debris as proof of the violation."

Templates & scripts

Copy, fill in the [highlighted] bits, and send.

1. Email Template: Complaint against construction dust

To: [Your State Pollution Control Board Email - e.g., [email protected] for Delhi] Subject: Formal Complaint: Violation of C&D Waste Management Rules 2016 at [Location]

To the Member Secretary,

I am writing to report a violation of the Construction and Demolition Waste Management Rules, 2016 at a site located near [Landmark/Address].

The site is currently [mention violation: e.g., operating without wind-breaker nets / failing to sprinkle water on debris / transporting material in uncovered trucks]. As per the CPCB’s SAMEER app, the AQI in this area is currently [Number], and this site is significantly contributing to local PM10 levels.

Attached are timestamped photographs of the violation. I request you to:

  1. Conduct a spot inspection.
  2. Impose Environmental Compensation (EC) as per the NGT guidelines.
  3. Direct the project proponent to implement dust mitigation measures immediately.

I look forward to an update on the action taken within 48 hours.

Regards, [Your Name] [Your Phone Number]

2. RTI Script: Checking on a faulty air sensor

Public Information Officer: State Pollution Control Board Text of Application:

  1. Provide the total number of days the Air Quality Monitoring Station at [Location/Station Name] was non-functional or showing "No Data" between [Start Date] and [End Date].
  2. Provide a copy of the maintenance contract and the name of the vendor responsible for the upkeep of this station.
  3. Provide the total amount of money spent on the repair and maintenance of this specific station in the last 2 financial years.

3. Helpline Script: Reporting waste burning

You: "Hello, I want to report an illegal waste burning incident under the Solid Waste Management Rules, 2016." Operator: "Sir/Ma'am, please call the fire department." You: "This is not a fire emergency; it is an environmental violation. Please record a complaint for the [Nagar Nigam/Municipality] Sanitary Inspector. The location is [Address]. There is thick black smoke, and it is a health hazard for the residents. Can I have the complaint reference number, please?"

Frequently Asked Questions

1. Why does my iPhone/Apple Weather show a different AQI than the SAMEER app?

Most international apps use the **US-AQI standard**, which has different weightages and "breakpoints" for pollutants compared to the **Indian National AQI (NAQI)**. For example, a PM2.5 concentration that is "Moderate" in India might be "Unhealthy" in the US system. For legal action or reporting in India, only the CPCB's NAQI numbers are valid.

2. Can I get a fine for burning dry leaves in my own garden?

Yes. Under various National Green Tribunal (NGT) orders and the **Solid Waste Management Rules, 2016**, burning any kind of waste (including "green waste" like leaves) in the open is illegal. In cities like Delhi, the fine can be as high as ₹5,000 for a first-time individual offence and up to ₹25,000 for bulk generators.

3. What if there is no AQI station in my town?

India currently has over 500 Continuous Ambient Air Quality Monitoring Stations (CAAQMS), but they are mostly in big cities. If your town doesn't have one, the CPCB uses "Manual Stations" where data is updated twice a week. If neither exists, you can petition your local MLA or Municipality under the **National Clean Air Programme (NCAP)** to install a "Low-Cost Sensor" or a formal monitoring station using city improvement funds.

4. Can I sue the government for high AQI?

You can approach the **National Green Tribunal (NGT)**. Under **Section 14 of the NGT Act, 2010**, the tribunal has the power to hear all civil cases where a substantial question relating to the environment is involved. You don't necessarily need a lawyer to file a letter petition to the NGT Chairperson if the air pollution in your area is consistently hazardous.

5. Who is responsible for dust from a Metro or Highway project?

The project proponent (e.g., DMRC, NHAI) is legally responsible. Even though they are government bodies, they must follow the **EIA (Environmental Impact Assessment) Notification, 2006**. If they fail to suppress dust, you can report them to the **Ministry of Environment, Forest and Climate Change (MoEFCC)** regional office or the SPCB. No one is exempt from dust mitigation laws.

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How to read the National Air Quality Index (AQI) in India · HowToHelp