Tipping point: revealing the cities where exercise does more harm than good

In at least 15 cities, air pollution has now become so bad that the danger to health of just 30 minutes of cycling each way outweighs the benefits of exercise altogether, according to new researchSuffocating planet: air pollution around the world today – liveTips: what to do when there’s a smog alertWho says exercise is always good for you? Cycling to work in certain highly polluted cities could be more dangerous to your health than not doing it at all, according to researchers.
In c