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Hot weather worsens air pollution by turning car exhaust into smog, which can make life miserable for people with asthma and other breathing problems.

炎热的天气使汽车尾气变成烟雾，加剧了空气污染，这可能使患有哮喘和其他有呼吸问题的人的生活更加痛苦。

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Heat exhaustion may also produce a feeling of sickness, a fast heartbeat,breathing problems and pain in the head,chest or stomach.

VOA: special.2010.07.27

And traditional CPR should be used for any victims of drowning or collapse from breathing problems.

VOA: special.2009.06.09

The World Health Organization has warned people with breathing problems to remain indoors as much as possible when the ash is falling.

VOA: standard.2010.04.17

Six people were treated for breathing problems after a chemical spill at a factory in Cambridgeshire.

BBC: Wisbech factory workers treated after chemical spill

This prevents air flowing through the lungs, causing breathing problems and sometimes damaging the lung tissues.

BBC: Gene key to baby chest infection

Now at the age of 17, she worries that she has a lot of breathing problems.

CNN: Teens have fewer aids for kicking the habit