Air Quality Index (AQI) in Fortress Hill, Hong Kong 🇭🇰
Air quality in Fortress Hill is currently 173 on the US AQI scale, rated Unhealthy.
Health Recommendations for Fortress Hill Residents
Health alert: everyone may begin to experience health effects. Members of sensitive groups should avoid all outdoor physical activity, and others should minimize time spent outside in Fortress Hill.
Fortress Hill Air Pollution: Detailed Pollutant Breakdown
Fortress Hill's Main Air Pollutant Today
The main concern in Fortress Hill right now is NO2 at 169.4 µg/m³, about 6.8x the WHO 24-hour guideline.
Air Quality Health Advice for Fortress Hill
| General public | Reduce prolonged or heavy exertion outdoors and take more breaks. |
|---|---|
| Sensitive groups | Sensitive groups should avoid prolonged or heavy exertion and stay indoors when possible. |
Air Quality in Other Cities in Hong Kong
Browse Air Quality in Hong Kong by cities in alphabetical order:
Frequently Asked Questions about Air Quality in Fortress Hill
What is the air quality (AQI) in Fortress Hill right now?
The current air quality index in Fortress Hill is 173 — categorised as Unhealthy.
Is the air in Fortress Hill safe to breathe today?
Today's air quality in Fortress Hill is rated Unhealthy on the US EPA scale.
What is the PM2.5 level in Fortress Hill right now?
The fine-particle (PM2.5) concentration in Fortress Hill is currently 86.8 µg/m³. PM2.5 is the most health-relevant pollutant — the WHO 24-hour guideline is 15 µg/m³.
What is the PM10 level in Fortress Hill right now?
The coarse-particle (PM10) concentration in Fortress Hill is currently 87.3 µg/m³.
What is the main pollutant in Fortress Hill right now?
The dominant pollutant in Fortress Hill right now is NO2 at 169.4 µg/m³.
Is it safe to exercise outdoors in Fortress Hill today?
Air quality in Fortress Hill is Unhealthy — sensitive groups should consider reducing prolonged outdoor exertion.
How to Read the Air Quality Index for Fortress Hill
Air is fresh and healthy. Safe for all outdoor activities.
Acceptable air quality, though sensitive groups should monitor comfort.
Vulnerable groups (children, elderly) should limit outdoor exertion.
Everyone begins to experience health effects. Stay indoors where possible.
Significant health impact for entire population. Emergency conditions.
Serious health alert: everyone may experience serious life-threatening effects.
Fine particles are at minimal, safe levels. Air is optimal.
Acceptable air, but haze may be present in urban areas.
Individuals with heart or lung disease should limit activity.
Particulate levels high enough to cause respiratory irritation.
Heavy haze. High risk to cardiovascular health for the public.
Lethal particulate concentrations. Critical neurological and lung risk.
Low levels of dust and coarse particles. Environment is safe.
Coarse particles may trigger coughing in sensitive groups.
Visible dust pollution. Sensitive groups should avoid heavy labor.
Widespread respiratory impacts likely for the population.
Dangerous dust and debris levels. Significant warnings issued.
Extremely high concentrations. Stay inside with filtration.
Surface ozone levels are within a safe, natural range.
Acceptable air, but sensitive individuals may feel chest tightness.
Rising ozone can trigger airway inflammation in active children.
Avoid heavy outdoor work during the hottest part of the day.
Serious lung function reduction likely across the public.
Emergency ozone levels. Risk of permanent lung tissue damage.
Nitrogen levels are optimal. Safe for everyone.
Typical background levels for high-density urban areas.
Increased risk of respiratory infections for vulnerable groups.
Significant airway inflammation likely near traffic zones.
Acute respiratory distress potential. High-risk groups stay indoors.
Toxic concentrations. Immediate health precautions required.
Carbon Monoxide levels are clean and non-toxic.
Acceptable; may affect those with specific heart conditions.
Reduced oxygen delivery to the heart may occur.
Headaches and fatigue may occur in urban canyons.
Significant cardiovascular distress. Mental confusion possible.
Lethal potential. Immediate risk of neurological collapse.
Optimal air quality with no sulfur detection.
Acceptable air; minor odors possible near industry.
Bronchoconstriction possible for active asthmatics.
Respiratory distress likely for the wider population.
Significant wheezing and shortness of breath likely.
Extreme respiratory danger. Significant life risk.
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 qualityHow is this AQI calculated?
The primary Air Quality Index (AQI) shown above is calculated using the US EPA Linear Interpolation formula based on PM2.5 concentration (Fine Particulate Matter).
- Current PM2.5: 86.8 µg/m³
- Calculation: Your city falls into the "Unhealthy" category (Category 4).
Is the AQI in Fortress Hill safe today?
Today's AQI is 173, which is categorized as Unhealthy. This means the air quality is unhealthy for the general population.