Jakarta and its surrounding cities are shrouded in thick smog this month, and even Indonesian President Joko Widodo, commonly referred to as Jokowi, appears to be no match for the haze, having dealt with a stubborn cough for four weeks that some say may be caused by the bad air.

“He has never felt like this,” Tourism and Creative Economy Minister Sandiaga Uno told reporters on Monday, adding that the President’s doctor pointed to the poor air quality as a potential contributor to his ailment.

There has long been concern, both at home and abroad, about the city’s smog problem, which, in recent weeks, has been more apparent than ever: Jakarta has been lingering near the top of world pollution rankings since May, and the capital was listed as the world’s most polluted city for several days last week, according to Swiss air quality technology company IQAir.