Air quality in Pakistan's Lahore reached 'hazardous' levels Thursday:: It's prompted urgent calls for action to reduce pollution"The smog crisis is harming our health, causing respiratory issues and illnesses.

Worsening air pollution sickened an estimated 1.8 million people in Pakistan's eastern Punjab province in the past month, health officials said Tuesday, as schools across the province were ordered to close for five days to protect children's health.