1A new report has found that air quality in the capital has improved slightly over the past year.
2The study, carried out by an international research group, measured pollution levels in forty major cities.
3According to the report, the improvement is largely due to stricter rules on factory emissions.
4The city has also invested heavily in electric buses and expanded its public transport network.
5Despite the progress, pollution levels remain well above the limits recommended by health experts.
6Doctors say poor air quality is still linked to thousands of hospital visits every year.
7Children and older people are especially vulnerable to the effects of polluted air.
8The report recommends planting more trees and creating additional green spaces in crowded districts.
9City leaders have welcomed the findings and promised to continue their environmental programmes.
10The full report was presented at an international conference on public health last week.