NEW YORK - (AP) - Mayor Michael Bloomberg has signed into law aban on smoking in New York City's parks, beaches, public plazas andboardwalks.

The ban goes into effect 90 days after Tuesday's signing. Thatmeans that by this summer those who break the law could face finesof $50 per violation, although the city has said it plans to relyon signs and social pressure instead of active enforcement.

Health Commissioner Thomas Farley says the law will protectpeople from dangerous secondhand smoke. But some health expertsquestion whether the smoke poses a serious danger in open, outdoorspaces. Critics of the law say the city is trampling on civilliberties.

Bloomberg's administration banned smoking in restaurants, barsand other public indoor spaces in 2002.