Inference- The U. N. health agency says nearly everybody in the world breathes air that doesn’t meet its standards for air quality and this causes respiratory- and blood-flow problems and lead to millions of preventable deaths each year.
The inference talks about two main points- i- most of the people in the world breathing low quality air. ii- health problems caused because of low quality air. In option 3, both these are discussed. Option 1 talks about urban space and air pollution. Option 2 talks about cities and pollution. Option 4 talks about safety of health workers.
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