Air Quality Index (AQI) in Hong Kong 🇭🇰

Live Air Quality Index (AQI) and PM2.5 Levels in Hong Kong

Currently, the Air Quality Index (AQI) in Hong Kong, the capital of Hong Kong, is measured at a score of 137. According to the US EPA health standard, this air quality rating is categorized as Sensitive. The current atmosphere in Hong Kong is influenced by a PM2.5 (fine particulate matter) concentration of 50.2 µg/m³ and PM10 levels recorded at 52.0 µg/m³. Monitoring of gaseous pollutants shows Nitrogen Dioxide (NO2) at 88.1 µg/m³.

Beyond the primary urban hubs, atmospheric conditions and smog levels fluctuate across Hong Kong based on industrial output, traffic density, and local weather patterns. Real-time pollution data and respiratory health alerts are also being actively monitored in cities like Hong Kong, Kowloon, Victoria, Tuen Mun and Sha Tin. Tracking these air quality metrics is essential for residents nationwide to manage outdoor exposure and maintain respiratory safety during periods of increased particulate concentration.

Air Quality Snapshot: Hong Kong Right Now

Across 26 monitored cities in Hong Kong, live air quality currently ranges from a low of 137 AQI in Hong Kong (the cleanest air right now) to a high of 137 AQI in Hong Kong (the most polluted). By US EPA health band, the nationwide distribution stands at 26 Unhealthy for Sensitive Groups. The average fine-particulate (PM2.5) concentration across these cities is 50.2 µg/m³ — approximately 10.0 times the World Health Organization (WHO) annual air quality guideline of 5 µg/m³.

Hong Kong Air Quality: Major Cities Index

* Air Quality Index (AQI) data for Hong Kong is calculated using the US EPA standard. Information is processed from multiple monitoring stations detecting PM2.5, PM10, and gaseous pollutants to ensure accuracy for respiratory health planning.

What Today's Readings Mean in Hong Kong

The median reading across 26 monitored cities is 137.0 AQI. The national spread is 0 points, from 137 in Hong Kong to 137 in Hong Kong. Average PM2.5 is 50.2 µg/m³ (10.0× the WHO annual guideline).

At least one monitored location is unhealthy for sensitive groups. Children, older adults, and people with heart or lung conditions should limit prolonged outdoor exertion in the affected city.

See the complete AQI and pollutant reference scales

Health & Scientific Resources

→ How to read US EPA Air Quality Index before going outside → Understanding Air Quality Index levels and what they mean → When haze forms and what it does to air quality

Air Quality in Hong Kong — FAQ

Common questions about AQI levels, pollutants, and data sources for Hong Kong.

What is the current air quality in Hong Kong?

Live AQI readings for 26 city(ies) across Hong Kong are listed above on the US EPA 0-500 scale.

Where does Hong Kong's AQI data come from?

Real-time readings come from ground-based monitoring stations operated by national environmental agencies in Hong Kong, delivered via WeatherAPI.com and aggregated using the EPA AQI formula.

What is a healthy AQI value in Hong Kong?

On the EPA scale used worldwide, 0-50 is Good, 51-100 is Moderate, 101-150 is Unhealthy for sensitive groups, 151-200 is Unhealthy, 201-300 is Very Unhealthy, and 301-500 is Hazardous. The WHO 24-hour PM2.5 guideline is 15 μg/m³.

Why do AQI readings vary between cities in Hong Kong?

Air quality is highly local — major pollution sources (traffic, industry, dust, wildfires) cluster around cities, while wind direction and topography move them around. Comparing nearby readings on this page is the best way to see how conditions change across Hong Kong.