FILE - In this Dec. 20, 2015 file photo, a woman wearing a mask for protection against pollution walks on a pedestrian overhead bridge as office buildings are shrouded with smog in Beijing. More than nine out of 10 people worldwide live in areas with excessive air pollution, contributing to problems like strokes, heart disease and lung cancer, the World Health Organization said Tuesday, Sept. 27, 2016. The U.N. health agency said in a new report that 92 percent of people live in areas where air quality exceeds WHO limits, with southeast Asia, eastern Mediterranean and western Pacific regions hardest hit. (AP Photo/Andy Wong, File)
The Air Quality Index is predicted to be 101 on Wednesday, which means the air could have health effects for up to 50 percent of the population.
People with heart or lung disease, older adults, teenagers and children should limit strenuous outdoor activities. During outdoor activities residents are advised to take extra breaks and choose less intense activities.
