Rising air pollution rates encourage people to drive more and walk less in the rural areas. Also, people don’t exercise thinking pollution may harm their health.
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‘Walking or cycling is good for you even in polluted cities as its benefits outweigh the harmful effects of air pollution.’
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Researchers from the University of Cambridge combined data on the effects of exercise on life expectancy with pollution readings from cities all over the world. They found that risks of air pollution could be overcome by cycling or walking 30 minutes every day even in polluted cities. 
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Also, only 1% of polluted cities fall under the World Health Organization's Ambient Air Pollution Database. Therefore, it is always better for your health to walk or cycle than take a more sedentary option like a bus, train or driving a car.
“Even in Delhi, one of the most polluted cities in the world - with pollution levels 10 times those in London - people would need to cycle over five hours per week before the pollution risks outweigh the health benefits," said Dr. Marko Tainio, the lead author of the study.
"We should remember, though, that a small minority of workers in the most polluted cities, such as bike messengers, may be exposed to levels of air pollution high enough to cancel out the health benefits of physical activity."
Source-Medindia