Based on the air quality data in the downtown and College Heights areas, the high levels were due to a mix of dust (coarser particles), and combustion emissions (smoke).

 

The weak disturbance which went through the region late last night helped improve the air quality. The 24 hour PM₁₀ rolling average was 50 µg/m³ at the Plaza 400 downtown site at 10:00 am, 58 µg/m³ at BCR, and 37 µg/m³ at College Heights. The 24 hour PM_2.5 rolling average was 22 µg/m³ at the Plaza 400 downtown and 18 µg/m³ at College Heights. Even though the 24-hour average for PM₁₀ at the Plaza and BCR sites are still above 50 µg/m³, hourly values are expected to remain low for the rest of the day.