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For the most authoritative Delhi reading, open the Central Pollution Control Board’s (CPCB) Delhi-NCR AQI portal, select Delhi or a nearby monitoring station, and record the timestamp, location and station name. Use the city or NCR average for a broad picture, but use the nearest complete station to estimate the air you are breathing. The CPCB Central Control Room also notes that the worst-station AQI may be considered when issuing health advice and deciding action.
Do not treat PM2.5 or PM10 as interchangeable with AQI. CPCB converts each pollutant concentration into a pollutant-specific sub-index; the highest relevant sub-index determines the reported AQI category. PM2.5 is finer and can penetrate deeper into the lungs, while PM10 is coarser and is often associated with dust and construction.
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Check Delhi AQI in a few minutes
The value on an AQI page is meaningful only when you know where and when it was measured. Follow this sequence whenever you need a current reading.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstall- Open the CPCB Delhi-NCR AQI portal. Use the official CPCB dashboard rather than an unlabeled screenshot or a social-media post. The portal brings together readings from multiple monitoring locations.
- Select Delhi or the relevant Delhi-NCR view. If the dashboard offers both a regional average and individual stations, open both. A regional value is a summary, not a measurement taken at every address.
- Choose the station closest to the place and time that matter. For a commute, use a station near the route or destination. For a child’s school or an older relative’s home, prioritize the station nearest that location.
- Write down the timestamp, city or region, station name and displayed values. Include the averaging period if the interface shows it, and note whether the data are marked complete, provisional or delayed. Without these details, two apparently different AQI numbers cannot be compared fairly.
- Identify the prominent pollutant or sub-index. Look at PM2.5, PM10 and any other pollutant channels shown, then see which one is driving the overall AQI. The largest raw concentration is not necessarily the pollutant producing the highest sub-index.
- Check the CPCB Central Control Room information when conditions are changing quickly. It can identify the worst station and the broader health-advisory context. A worst-station value is useful for caution and planning, but it is not a claim that every Delhi neighborhood has that exact concentration.
Take a fresh reading before strenuous outdoor exercise, a long school commute, outdoor construction work or a trip involving someone with asthma or another respiratory condition. Delhi air can differ sharply between neighborhoods because traffic, dust, wind and local sources are unevenly distributed.
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Which Delhi AQI number should you trust?
There is no single number that answers every question. “Trust” means choosing the measurement that matches your decision and understanding its limitations.
| Reading type | Best use | What it can miss | How to use it |
|---|---|---|---|
| Delhi or Delhi-NCR average | A quick regional snapshot and trend over time | Neighborhood-level peaks and local sources near your home, school or workplace | Use it to understand the broad situation, then check a nearby station before making an exposure decision |
| Nearest individual station | Estimating conditions at a particular neighborhood or route | Differences between the station site and your exact address; gaps or delayed updates | Compare distance, timestamp, averaging period and data completeness before relying on it |
| Worst station reported by the Central Control Room | Precautionary health planning and official response | It may be far from you and may not represent every locality | Use it as a warning signal and follow the associated advisory, not as a personal exposure measurement |
When two stations disagree, first check whether they updated at the same time and use the same averaging period. Then consider distance and surroundings: a roadside station, a residential station and one near a construction zone can legitimately report different conditions. A reading that is older, incomplete or clearly marked provisional should not be compared as if it were simultaneous with a complete reading.
What Delhi’s AQI categories mean
CPCB’s National AQI public-information document (accessed October 15, 2026) groups the index into six bands. The number is a communication tool: it translates pollutant measurements into a common health signal, but it does not guarantee that every person will have the same response.
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|---|---|---|---|
| 0–50 | Good | Little or no risk, with minimal health impact. | Normal outdoor activity is generally appropriate for most people. |
| 51–100 | Satisfactory | Generally acceptable; sensitive people may experience minor breathing discomfort. | People who notice symptoms should reduce prolonged exertion and monitor how they feel. |
| 101–200 | Moderate | People with lung disease, asthma, children and older adults may experience breathing discomfort; sensitive groups should reduce prolonged outdoor exertion. | Shorter, easier outdoor activity is a sensible adjustment for vulnerable people. |
| 201–300 | Poor | Prolonged exposure can cause breathing discomfort for most people; at-risk groups should be especially cautious with moderate outdoor activity. | Reconsider long or strenuous outdoor sessions and watch for symptoms. |
| 301–400 | Very Poor | Prolonged exposure increases the risk of respiratory illness; children, older adults and people with existing illness need added protection. | Limit time outdoors, move exercise indoors where possible and follow local advisories. |
| 401–500 | Severe | Significant effects can occur even in healthy people, with serious impacts possible for people with existing respiratory or cardiovascular disease. | Avoid unnecessary outdoor exposure and treat official warnings as urgent. |
The band is not a personal medical diagnosis. A person with asthma can react at a lower AQI than someone without it, and symptoms can be influenced by exertion, duration, indoor filtration and other pollutants. Seek medical care for severe or rapidly worsening breathing difficulty rather than trying to interpret the AQI alone.
How CPCB turns pollutant readings into one AQI
Delhi’s AQI is calculated in stages. For each pollutant with sufficient data, CPCB maps the measured concentration to a pollutant-specific sub-index. Those sub-indices are then considered together. CPCB’s explanation states: “The highest relevant sub-index becomes the reported AQI category and public health signal for that period.”
This rule explains several common surprises:
- A PM2.5 concentration can be lower in raw numerical terms than PM10 while still producing the highest sub-index and determining the AQI category.
- A low PM10 value does not make the overall AQI low if PM2.5 or another pollutant has a higher sub-index.
- The overall AQI is not an average of the PM2.5 and PM10 numbers, and it is not whichever raw number looks larger.
- If a different pollutant becomes the highest relevant sub-index later, the AQI category can change even when PM2.5 and PM10 move only slightly.
When reading the dashboard, therefore, record both the overall AQI and the pollutant identified as the leading contributor. The category tells you the broad health signal; the leading sub-index helps explain why the signal is at that level.
PM2.5: fine particles that reach deep into the lungs
PM2.5 refers to particulate matter with an aerodynamic diameter of 2.5 micrometres or less. These particles are small enough to travel deep into the respiratory system. CPCB lists vehicle exhaust, biomass burning, coal combustion, diesel generators and secondary aerosol formation among common sources.
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For a practical reading, pay attention to the PM2.5 channel and its sub-index when deciding whether to run, cycle, walk quickly or send a sensitive person outside. A PM2.5-driven AQI is a reason to reduce prolonged exertion even if the PM10 number appears comparatively modest.
PM10: larger inhalable particles often linked to dust
PM10 refers to inhalable particulate matter with an aerodynamic diameter of 10 micrometres or less. It includes smaller particles as well as coarser material that can enter the airways. CPCB associates PM10 with road dust, construction, quarrying, industrial handling and soil that has been resuspended by traffic or wind.
Higher PM10 commonly feels more connected to dusty conditions. Exposure can cause coughing, throat irritation and breathing discomfort and can worsen existing respiratory disease. A dusty road or construction site may produce a noticeable PM10 increase even when PM2.5 is not the dominant pollutant.
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Do not infer that PM10 is harmless because it is larger than PM2.5. Both channels matter, and either can produce the highest relevant sub-index under the right conditions.
How to read PM2.5 and PM10 together
Use this four-part check instead of focusing on one number:
- Confirm the timestamp and station. A PM2.5 value from one neighborhood and a PM10 value from another are not a valid pair.
- Read both concentrations. Note whether one is rising sharply, but do not rank health risk from the raw numbers alone.
- Find the leading sub-index. The dashboard may identify the pollutant responsible for the overall AQI. If it does not, compare the pollutant-specific sub-index information it provides.
- Apply the AQI band to the decision. Adjust outdoor duration and intensity, especially for children, older adults and people with lung or heart disease.
For example, if the overall category is Poor and PM2.5 has the highest sub-index, the key issue is fine-particle exposure during prolonged exertion. If PM10 is the leading sub-index near a construction corridor, reducing time in dusty areas and avoiding vigorous activity there addresses the immediate source more directly. These are interpretation patterns, not substitutes for the station’s current data.
What to do at each level
CPCB advises checking AQI before outdoor exercise, school commuting, construction scheduling and decisions involving vulnerable family members. Use the category as a planning trigger:
| Situation | Reasonable response |
|---|---|
| Good or Satisfactory | Most people can continue normal plans. Sensitive people should pay attention to minor breathing discomfort and shorten prolonged exertion if symptoms appear. |
| Moderate | Children, older adults and people with asthma or lung disease should reduce prolonged outdoor exertion. Schedule demanding activity for a cleaner period if the dashboard shows one. |
| Poor | Reduce long or intense outdoor sessions, particularly for at-risk people. Reconsider outdoor construction tasks that can be postponed and monitor symptoms. |
| Very Poor | Limit outdoor exposure, protect children and older adults, and follow local advisories. Keep necessary trips shorter and avoid strenuous activity outdoors. |
| Severe | Avoid unnecessary outdoor activity for everyone. People with respiratory or cardiovascular disease should follow their clinician’s plan and official emergency guidance. |
CPCB advises using a mask when pollution is severe or when high-pollution travel cannot be avoided. A mask can reduce exposure, but it does not make polluted outdoor air safe, and no universal “safe AQI” threshold or particular mask model is endorsed here. Fit, filtration performance and the duration of exposure all affect protection.
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Choosing and comparing monitoring stations
If you are deciding between two Delhi stations, compare the same attributes in the same order:
| Attribute | Why it matters | Question to ask |
|---|---|---|
| Timestamp | Air can change quickly with traffic and weather. | Were both readings updated at the same time? |
| Distance from you | Local emissions and wind can make nearby neighborhoods different. | Which station is closest to the place and route being assessed? |
| Averaging period | A short or long averaging window describes different conditions. | Does the portal show the same averaging period for both values? |
| Data completeness | Missing or provisional data can make comparisons unreliable. | Is either station flagged as incomplete, delayed or provisional? |
| Site surroundings | Roadside traffic, construction and open ground influence local readings. | Does the station environment resemble the exposure you are planning for? |
| Regional versus single-station status | An average smooths local peaks; a station captures one point. | Am I looking at a city/NCR average or one monitor? |
No station is universally “the best.” A station near your actual exposure is usually more informative for a personal decision, while the regional average is better for communicating the broad Delhi situation. Keep the station name with any screenshot or message so another person can interpret it correctly.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Using a home PM monitor without confusing it with CPCB data
A consumer monitor can help you observe indoor changes, such as the effect of cooking, ventilation or filtration, but it is supplemental. It does not replace CPCB’s official station measurements.
When comparing a home device with CPCB data, check:
- Particle-size channels: Does it report both PM2.5 and PM10, or only one size?
- Calibration and quality documentation: Is there clear information about calibration, sensor limits, humidity effects and maintenance?
- Update interval: How often does it refresh, and does that differ from the CPCB station’s reporting window?
- Placement: An indoor monitor cannot be expected to match an outdoor station. Keep it away from kitchens, direct airflow, windows, vents and obstructed corners unless you are deliberately testing those conditions.
- Data completeness: Record whether the device was stable, recently moved or affected by a local event such as incense, cooking or a vacuum cleaner.
If the home monitor and CPCB station disagree, first check location, time, indoor versus outdoor placement and averaging period. Treat the consumer reading as evidence about that room, not as a replacement AQI for Delhi.
Common mistakes and fixes
Looking only at the city average
Problem: A regional average can hide a local spike near a busy road or construction site.
Fix: Check the closest station and record its timestamp before commuting, exercising or planning work outdoors.
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Comparing readings taken at different times
Problem: Wind, traffic and emissions can change the result between updates.
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Fix: Compare timestamps and averaging periods; discard stale screenshots when making a current decision.
Assuming the biggest raw PM number sets AQI
Problem: AQI uses pollutant-specific sub-indices, not a simple raw-number ranking.
Fix: Identify the leading sub-index shown by CPCB and use that pollutant to explain the category.
Treating PM2.5 and PM10 as interchangeable
Problem: They represent different particle sizes and often have different sources.
Fix: Read both channels, then interpret the one with the highest relevant sub-index in context.
Assuming a mask makes severe pollution safe
Problem: A mask can reduce inhalation but does not eliminate exposure or make every outdoor activity safe.
Fix: Combine appropriate protection with shorter exposure, less strenuous activity and the local advisory.
Using a private monitor as an official AQI
Problem: Sensor calibration, humidity, placement and update intervals can differ substantially.
Fix: Use the home device for supplemental indoor information and use CPCB for the official station-based AQI.
A repeatable Delhi AQI checklist
- Open the official CPCB Delhi-NCR AQI portal.
- Select Delhi or the relevant NCR view.
- Check the regional average and the nearest suitable station.
- Record timestamp, station, city or region, averaging period and data status.
- Read PM2.5 and PM10 together.
- Identify which pollutant sub-index is highest.
- Use the AQI band to decide on duration and intensity of outdoor activity.
- For Very Poor or Severe conditions, limit unnecessary exposure, protect vulnerable people and follow official advisories.
- Recheck before a long commute, exercise session, school trip or outdoor work because conditions can change.
Bottom line
Use CPCB’s Delhi-NCR portal for the official AQI, but choose the station and timestamp that match your actual exposure. Treat the city average as a regional snapshot, the nearest complete station as the best local estimate, and the Central Control Room’s worst-station information as a precautionary signal. Read PM2.5 and PM10 separately, then let the highest relevant pollutant sub-index—not the largest raw number—explain the AQI category and the protection level you choose.
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