The area with the highest AQ Index (as of 17:00 MST) in is in the Helena area. Particle Pollution (PM2.5) is measuring at 74 (Moderate). This means air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution.
Over the next few days, the highest primary air pollutant will be Ozone (OZONE) in the Helena area. It is forecasted to be 0 (Good), meaning air quality is satisfactory, and air pollution poses little or no risk.
Below is a clickable map of Lewis And Clark County, Montana. The markers on the map identify large, populated cities. If you hover over a marker, it will display the city name and the current AQ index. The color of the city markers also references the current AQ risk level.
| Range | 0 - 50 | 51 - 100 | 101 - 150 | 151 - 200 | 201 - 300 | 301 - 500 |
| Color | ||||||
| Category | Good | Moderate | Unhealthy for Sensitive Groups | Unhealthy | Very Unhealthy | Hazardous |
Last Updated 13 minutes ago
Below is a list of cities in Lewis And Clark County where we track and forecast the AQ index. Click on a city name to get the current AQ index as well as any available forcasts.