The air quality index is alarmingly high in Pakistan and India. This week, smog has drastically reduced visibility, obscuring views of landmarks like the Taj Mahal in Agra. As a result, many flights have been delayed.

Pakistan ’s smog situation has gone from bad to worse as air pollution rose to a record in Lahore. Sensors tracked by the Swiss monitor IQAir recorded an air quality index of 1,300 in the country’s second-largest city at 5 p.m. local time, the highest this year and well beyond a level of 50 that is deemed safe.

Record-high air pollution in Pakistan’s Punjab province prompted authorities to keep government employees at home and close additional schools, as doctors reported an increase in people seeking treatm