 Some speculated that the more polluted air was caused by the many construction sites and industrial parks in Jurong, but NEA refuted this, claiming that they did not contribute to the haze.Polyclinics in Jurong and Bukit Batok had an increase of 20 percent admission for patients with respiratory problems and asthma.Schools islandwide restricted outdoor activities and had to rethink post-examination activities and training or revert to wet-weather programmes.