New York City is planning to limit the sulfur content in a type of heating oil used in thousands of buildings.

Mayor Michael Bloomberg and City Council Speaker Christine Quinn said Monday that the legislation caps the amount of sulfur allowed in No. 4 heating oil.

No. 4 is used in fewer than 4,000 of the city’s 1 million buildings. But environmental and health groups say reducing its sulfur content will help improve the air.

Last month, the state put restrictions on sulfur content in the more commonly used No. 2 heating oil.

The City Council is expected to pass the bill this week.

Watch & Listen LIVE