A limited number of studies have estimated the impact of air pollution on new incidences of chronic bronchitis.
There have been a few studies on this topic in the past.
The link between air pollution and bronchitis is well studied.
Tommy 50 increased his pace after the turn.
A dog is jumping.
The boy is at a lake.
People are sitting down on a hot summers day
A person is painting.
Boats once would bring provisions to the castle. `