Today's air quality alert is primarily caused by elevated levels of particulate matter (PM2.5) and, in some regions, ground-level ozone. For example, in Colorado, the highest Air Quality Index (AQI) for PM2.5 measured this morning was 76, which is considered "moderate". This level means sensitive groups (like those with heart or lung conditions and older adults) may experience respiratory symptoms and should consider reducing prolonged or heavy exertion. Ozone levels were "good," so the main concern is particulates.
In other regions of the US, such as Minnesota and the northeast, the air quality alert has been triggered by wildfire smoke. Heavy ground-level smoke from wildfires, especially in Canada, is moving into these areas and causing AQI levels to reach "unhealthy" categories for everyone. Wildfire smoke contains fine particles that can penetrate deep into the lungs, potentially worsening asthma, heart, and lung diseases.
Key factors causing today's air quality alert:
- Wildfire smoke: Traveling from active fires in Canada, significantly increasing PM2.5 in affected regions.
- Particulate matter (PM2.5): Elevated concentrations even in areas without direct wildfire smoke due to regional transport and atmospheric conditions.
- Ground-level ozone: Mostly at safe levels today, but can become problematic with heat and sunlight, especially for sensitive groups.
If you are unusually sensitive or in an area experiencing smoke or higher particulate matter, consider limiting outdoor activity and rigorous exertion.
