Unhealthy for Sensitive Groups (AQI 101–150)
Members of sensitive groups may experience health effects. The general public is less likely to be affected.
0–50
51–100
101–150
151–200
201–300
301–500
What Does This Mean?
PM2.5 is typically 35.5–55.4 µg/m³ — exceeding the EPA 24-hour standard. This level is common during mild pollution events, near busy roads, or during wildfire smoke episodes. The air may look slightly hazy.
Who Is Affected?
- Children and teenagers (lungs still developing)
- Adults 65 and older
- People with asthma, COPD, or heart disease
- People who exercise or work outdoors
- Pregnant women
What Should You Do?
- Sensitive groups: reduce prolonged outdoor exertion, take more breaks
- Move intense exercise indoors when possible
- Consider wearing a KN95/N95 mask during extended outdoor time
- Run HEPA air purifiers indoors, keep windows closed
- Check AQI before planning outdoor activities
Key Pollutants at This Level
PM2.5 is usually the primary driver. In summer, ozone can independently push AQI to this range. During wildfire events, PM2.5 dominates.