Lindsay bansNEW YORK (AP) — Mayor John V. Lindsay has banned all noontime traffic April 22 on Fifth Avenue, the city’s fashionable main street, in support of a nationwide “Earth Dav” protest of pollution.A 45-block stretch of the Manhattan avenue will be closed to vehicles from noon until 2 p.m. so that “one of the most beautiful streets in the world will become for this one day. at least, a pedestrian mall for our citizens to enjoy,” Lindsay said Wednesday.The mayor also announced the closing of Manhattan’s 14th Street from 2nd to 7th avenues between noon and midnight as part of the protest.Many business groups expressed dismay and shock at the plans. The Fifth Avenue Association, an organization of about 1,000 businesses, called the move “a very, very bad precedent” and said it was “absolutely opposed to it*’*Fifth Avenue Day' protestHowever, the EnvironmentalAction Coalition, which coordinates efforts to protect the environment, called the announcement “a major victory for the people.”“Earth Day began as a student movement. Students plan teach-ins April 22 at colleges and demonstrations against polluters of the environment inhundreds of communities. Lindsay said 14th Street “wasdecided upon to dramatize the environmental problem of urbanareas” because it “is the most striking symbol of these problems: power plants, changing neighborhoods and other aspects of the environment.” Asked if the street closings might be a trial balloon for city plans to make midtown streets into pedestrian mails. Lindsayreplied: ■. *“Who knows? Obviously we have high hopes for this. We hope it will work and then after it has happened we will have toevaluate it,’*