This map shows air quality data from 20 sites across Ottawa, split into Site A and Site B. Site A is typically closer to major roads or highways, whereas Site B was chosen due to its distance from a large road, allowing for comparison. All sites were monitored 4 times in August and September on two weekdays and two weekends, both in the morning and in the afternoon. This schedule allows for evaluation of differences in air quality between times of higher and lower traffic volumes, as well as differences with weather fluctuations. The map allows one to specify visualizing overall average, weekend or weekday averages, or morning or afternoon averages. Regular measurements were also taken from Ottawa’s Fletcher Wildlife Garden to capture regular air quality fluctuations in a non-trafficked area. All air quality monitoring was conducted by volunteers from across the city.

Air quality analysis is based on provincial standards for particulate matter, ozone and nitrogen (PM2.5, PM10, O₃, NO₂). Risk level is calculated from Ontario’s Air Quality Health Index (AQHI). Since data was not collected over 24 hours, the AQHI is based on the following: below Ontario standards = "Low" risk; higher than standards but lower than double = "Moderate" risk; double = "High" risk; and beyond is "Very High" risk. Learn more about air quality in Ontario, or their "Ontario’s Ambient Air Quality Criteria - Sorted by Contaminant Name".