Which city has better air quality, Hilo or Honolulu?
Honolulu has better overall air quality with an average AQI of 28 ("Good") compared to Hilo's AQI of 30 ("Good"). That is a difference of 2 AQI points.
How does PM2.5 compare between Hilo and Honolulu?
Honolulu has a lower PM2.5 average at 4.5 μg/m³, while Hilo averages 5 μg/m³. The EPA annual standard is 12 μg/m³. Both cities meet the EPA standard.
Which city has more good air quality days, Hilo or Honolulu?
Honolulu has 88% good air quality days compared to 86% in Hilo. That means residents of Honolulu enjoy clean air about 2 percentage points more often.
How does wildfire risk compare between Hilo and Honolulu?
Hilo has a low wildfire risk while Honolulu has a low risk. Both cities face similar wildfire smoke exposure levels.
What are the primary pollutants in Hilo vs Honolulu?
Hilo's primary pollutant is PM2.5 (ozone avg 22 ppb), while Honolulu's is PM2.5 (ozone avg 24 ppb). Both cities share the same primary pollutant, though concentrations differ.