Difficulties in concentration, dizziness, or even itchy nose can lie behind hundreds of traffic collisions each year. And air pollution is here to blame. A rise of nitrogen dioxide (NO2) only by 1 μg/m3 results in 2% higher risk of traffic accidents occurring. Recently published data from The London School of Economics and Political Science points out that air inside vehicles can be more than twice as polluted as the outdoor, especially as the NO2 tends to accumulate in a small spaces. Inhaled toxic compounds affect driver’s psychological as well as physiological state thus significantly impairing concentration and prolonging reaction time. By reducing the NO2 emission we could not only improve our health and minimise the climate change, but most importantly prevent lethal traffic accidents.