Air Pollution
Officials issued a "yellow alert" for smog in Shanghai this week.
Customers were unhappy with the 15-cent fee.
You have to see it to believe it.
WHAT'S HAPPENING
Pollution has soared to abnormal levels in Beijing over the past few days.
Air pollution is now at hazardous levels in the Chinese capital.
The news comes just before a major global climate summit in Paris.
The fog caused massive flight delays.
A new Harvard study shows that reducing pollutants and carbon dioxide can have a "profound impact" on decision-making.
New Delhi's transport minister also wants to introduce pollution taxes.