Nitrogen dioxide emitted by motor vehicles has been above the legal limit in London for longer than most people care to remember. This means that pedestrians & cyclists can't really avoid pollution in the capital. However it is possible to cut your exposure to air pollution in half by avoiding the city's busiest roads.
The Cross River Partnership can help you find a healthier route for your walking and cycling journeys with a new interactive map, the Clean Air Route Finder. The map allows you to enter a starting point and a destination for your walk and then suggests routes that avoid the busiest roads.
The Clean Air Route Finder in fact suggests three different routes for each query. The red route shows the most polluted walk or ride. The green suggestion shows you the route with the lowest pollution. The amber route is somewhere in the middle. The map also tells you the distance and the estimated walking or biking time for each route.
Cycling and walking route finders depend to a large degree on the underlying routing data. The Clean Air Route Finder works really well in my neighborhood, fully utilizing road free bike paths and canal towpaths (you might be surprised how many other biking & walking direction maps ignore these routes). Judging by its choice of the cleanest routes it also seems to have a good understanding of the level of traffic on London's roads.
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