Figure 14.1.3 Nitrogen dioxide annual average concentration
Nitrogen dioxide (NO2) annual average concentration (ppb) by year, London, 2008 to 2017
Source:Ontario Ministry of the Environment, Conservation and Parks. Air quality in Ontario 2017 Report [Internet]. Toronto (ON): Queen’s Printer for Ontario; 2017 [updated 2019 Jun 20; cited 2019 Oct 28]. Available at https://www.ontario.ca/document/air-quality-ontario-2017-report
In London, the annual average concentration of nitrogen dioxide in the air decreased from 10.8 ppb in 2008 to 5.8 ppb in 2017.