Sector 51 air quality · Gurugram, Delhi NCR
Calm, cold air keeps pollution pressed close to the ground on days like this
US AQI 241 (Very Unhealthy) at the HSPCB monitor in Sector 51, Gurugram, the 65th highest of 81 Delhi NCR monitors reporting. India's official NAQI (CPCB) 335 (Very Poor). Main pollutant: PM2.5.
Updated
Last 24 hours: worst 338 at midnight yesterday, best 183 at 8 pm yesterday (US AQI)
Pollutants at Sector 51
- PM2.5 · µg/m³16611.0× WHO limit
- PM10 · µg/m³3317.4× WHO limit
- NO₂ · µg/m³34.2Under WHO limit
- O₃ · µg/m³11.7
- SO₂ · µg/m³6.4Under WHO limit
- CO · mg/m³2.03
This hour's readings at this monitor. WHO multiples use the 2021 24-hour guidelines.
Where Sector 51 ranks in Delhi NCR
- 65thmost polluted of 81 Delhi NCR monitors right now
- 48thof 68 NCR monitors, 6 to 19 October 2026 (average NAQI 141)
- 193average US AQI, last 30 days
- 387Gurugram's city figure now
In our study of every Delhi NCR monitor from 6 to 19 October 2026, Sector 51 ranked 48th of 68, with a mean daily NAQI (CPCB's index) of 141, against 131 in mid-September. Its daily NAQI was above 200 (Poor) on 0 of the 14 days. See the full ranking.
Most polluted right now: Sector 110 932 · Sector 39 824 · Teri Gram 677 · North Campus, DU 665 · Chandni Chowk 664.
Is it safe outside in Sector 51 right now?
Health alert: the risk of health effects is increased for everyone.
Walking and commuting
LimitOnly essential trips. Wear a well-fitted N95 or FFP2 mask outdoors.
Running and jogging
AvoidRun indoors only, with windows closed.
Cycling
AvoidAvoid riding outdoors.
Children playing outside
AvoidKeep children indoors. Cancel outdoor sports and assemblies.
Older adults and heart or lung conditions
AvoidStay indoors with filtered air.
Open windows
AvoidKeep windows and doors closed.
Mask outdoors
EssentialN95 or FFP2 mask strongly advised for any time outdoors.
Air purifier indoors
EssentialRun a HEPA purifier on high with windows closed.
Based on the US EPA Air Quality Guide, applied to the current US AQI category. If you have symptoms, follow your doctor's advice.
When the air is worst in Sector 51
Last 7 days, India timeOver the last 7 days, the air at this monitor was worst from 8 pm to 11 pm (average US AQI 382) and cleanest from noon to 3 pm (200). Plan walks, runs and open windows for the cleaner hours.
Sector 51 air quality, last 24 hours
Hourly US AQI, 19 of 24 hours, India timeIn the last 24 hours the US AQI at this monitor was highest at midnight yesterday (338, Hazardous) and lowest at 8 pm yesterday (183, Unhealthy).
Sector 51 air quality, last 30 days
Daily average, 26 days- 193average US AQI
- 354worst day, 5 November
- 87cleanest day, 15 October
- 21days above 150 (Unhealthy or worse)
Nearby monitors
All of GurugramThe most polluted areas of Delhi NCR, ranked →
Sector 51 air quality: common questions
What is the AQI in Sector 51 right now?
The US AQI at the HSPCB monitor in Sector 51, Gurugram is 241 (Very Unhealthy), the 65th highest of 81 Delhi NCR monitors reporting. Over the last 24 hours it ranged from 183 (8 pm yesterday) to 338 (midnight yesterday). The main pollutant is PM2.5. The same air reads India's official NAQI (CPCB) 335 (Very Poor).
What time is the air worst in Sector 51?
Over the last 7 days, from 8 pm to 11 pm India time, when the monitor averaged 382. The cleanest stretch was noon to 3 pm, at 200.
Is Sector 51 one of the most polluted areas in Delhi NCR?
From 6 to 19 October 2026, Sector 51 ranked 48th of 68 Delhi NCR monitors by mean daily NAQI, CPCB's index (141). Right now it is 65th of 81. See the full ranking.
How has Sector 51's air been over the last 30 days?
The monitor averaged a US AQI of 193 over 26 days with data. The worst day was 5 November at 354 and the cleanest 15 October at 87. 21 days were above 150 (Unhealthy or worse).
Where does Sector 51's air quality data come from?
From the continuous monitoring station run by the Haryana State Pollution Control Board (HSPCB) in CPCB's national network. Good Air shows the US EPA AQI worked out from those readings, and CPCB's own National Air Quality Index (NAQI) beside it. Good Air does not estimate or adjust the readings.
Source: Haryana State Pollution Control Board (HSPCB), via CPCB's national monitoring network. One monitor shows the air around it, which can differ from a few streets away. Readings are published by the monitoring agency and may be revised.