MEXICO CITY - Commentators chuckle that urban sunbathers will choke on bus fumes and a television skit shows a plump man in a bathing suit stumbling around gridlocked cars.

The Mexico City mayor's plan to build four beaches in the smoggy mountain capital has been lampooned as a joke and a waste of money by Mexico's elite, who vacation at ocean resorts. But the mayor's supporters welcome the sand as a city getaway for millions of poor people who have never seen a beach.

The first beach opened Tuesday, luring hundreds of families to soak up the sun, play volleyball and munch on tacos, surrounded on the sand by soaring apartment buildings. Booming Mexican pop music blared from radios.

"This is the best thing they have done in Mexico City in a long time,'' said Anaberta Castillo, 32, whose six children were romping in the sand and splashing in the pool.

"The kids love it.''

The jokes about the urban beaches reflect Mexico's sharp class divisions. Wealthy Mexicans pack beach resorts during the Easter holiday, when temperatures in Mexico City are expected to be in the low 30s C. But millions earn the minimum wage worth about of C$5 a day and cannot afford a holiday.

"There is a typical discriminatory attitude to the urban beaches among Mexico's rich,'' said Guadalupe Loeza, an author critical of Mexican high society.

"The wealthy can fly off to their houses in Acapulco and Cancun. But for many normal people, a beach in Mexico City is a magnificent option to take the children.''

The plan was inspired by artificial beaches in European capitals such as Paris, Berlin, Rome, Amsterdam and Budapest. The Paris beach, which turns the banks of the River Seine into a faux-tropical retreat, met with criticism when it opened in 2002. But it attracted nearly four million sun lovers to its deck chairs and white sand last year.

The Mexico City beach that opened Tuesday was located in a park built for the 1968 Olympics, and Mayor Marcelo Ebrard has said the other beaches will be created next to lakes and swimming pools in other parks around the capital. Much of the sand has been shipped in from the coastal state Veracruz for about $230,000, the mayor said.

"I don't know why this is annoying people so much,'' Ebrard said.

"It doesn't cost the government much work to adapt spaces so people can have a good time with their families. To those who don't want to use the beaches it seems a bad idea. But to most people, it's a great idea.''

Critics include politicians from President Felipe Calderon's conservative National Action party who say the money could be better spent fixing sports grounds and plazas than creating beaches.

"There is so much richness in Mexico City that needs rescuing and authorities get distracted by these proposals,'' said Federal Water Commissioner Jose Luis Luege of National Action.

"The truth is, it really makes me laugh.''

Media pokes fun

Mexican media have repeatedly poked fun at the beach plan.

The Televisa network showed a reporter in flippers and an inflatable float around his waist bathing in a city fountain. The Mexico City tabloid El Grafico called it a Family Burron-style beach, referring to a comic strip about a poor family that has huge messy picnics with neighbours and relatives.

Claudia Rodriguez, a 23-year-old marketing graduate looking for work at the stock exchange, chortled at the mention of the urban beaches.

"It's absurd, illogical having beaches in Mexico City,'' she said with a grin.

"Sunbathers will risk being hit by passing buses.''

But Juan Hernandez, a 31-year-old street collector for the Red Cross, said his two young sons have never been to the sea.

"It will be fantastic,'' he said.

"You need a place to escape to in these baking, hot days.''

Javier Bustos, a 20-year-old bank employee, said the beaches are a good idea but he fears the city government will forget about maintenance.

"They might look nice at first,'' Bustos said.

"But soon they will turn into garbage dumps.''