Air Quality Index (AQI) rating and main air pollutant count by day, from 2008 to 2018.

The Air Quality Index (AQI) summarizes in one measure the levels of ground-level ozone, particulate matter (such as soot), carbon monoxide, sulfur dioxide, and nitrogen oxide. Exposure to these pollutants can cause short-term health effects such as irritation to the eyes, nose and throat; coughing; sneezing; runny nose; and shortness of breath. Continued exposure can also worsen medical conditions such as asthma and heart disease.

Erie County's count of AQI Good Days has fallen over the last 3 years, but overall is higher than the preceding 8 years, those days that are filling the void are only at AQI Moderate Days.

Data from Environmental Protection Agency (EPA) as of 2018.