Nitrogen Oxides Pollution
Emissions of NO and NO2 from combustion processes, causing tropospheric ozone formation, respiratory effects, and eutrophication.
Formula
N2 + O2 → 2NO (high temperature combustion)
Real World
London's Ultra Low Emission Zone (ULEZ), introduced in 2019 and expanded in 2023, cut roadside NO2 concentrations by around 44% in central London, directly reducing respiratory hospital admissions.
Exam Focus
When asked to 'evaluate' NOx controls, address both effectiveness and limitations (e.g. catalytic converters reduce NOx but increase CO2).
How well did you know this?