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Free testing for PM2.5 in Shanghai

Experts suggested ventilating rooms and opening windows after a rainfall when the air is clean outdoors.

Questions:

1. What city will offer free PM2.5 testing?

2. What can the tiny particles trigger in the lungs?

3. How many households have benefited from the service in past five years?

Answers:

1. Shanghai

2. severe cardiovascular and respiratory disorders

3. 13,000

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