A child stands at the door of a shipping container serving as his accommodation in Shanghai on March 4. The containers, which house different families, were set up by the landlord, who charges rent of 500 yuan ($80) per month for each container.

A mother and her child are seen inside their shipping container.

People congregate outside their shipping container.

A mother and her child eat dinner.

A child does homework inside a shipping container.

A couple wearing a mask and a scarf visits the Bund in front of Pudong Lujiazui financial area on a hazy day in Shanghai on Jan. 16.

Waste gas is discharged into the air by an oil refinery plant in Qingdao city, eastern China's Shandong province, on Jan. 16.

Travel photos are displayed in a photography service shop at the Bund in front of Pudong Lujiazui financial area on a hazy day in Shanghai on Jan. 16. Chinese media said on Monday the government had to take urgent action to tackle air pollution, which has blanketed parts of the country at dangerous levels in recent days, and one newspaper called for a re-think of a "fixation" on economic growth.

Children are put on drips as many of them are diagnosed with respiratory diseases at a provincial children's hospital in Hefei, Anhui province on Jan. 16. Days after choking smog blanketed China's capital, the country's premier-designate added his voice to appeals to curb the toxic haze, but he offered few specifics and said there was no quick fix. Particulate matter with a 2.5 micrometer diameter, known as PM2.5, can cause cardiopulmonary disease, lung cancer and acute respiratory infection, according to the Journal of Toxicology and Environmental Health.

A tourist looks at the Forbidden City as pollution covers the city on Jan. 16 in Beijing.

A resident holds a spittoon as he walks in an area where old residential buildings are being demolished to make room for new skyscrapers in central Shanghai on October 17, 2012.

A man rests on a motorcycle in front of an advertisement in central Shanghai on October 18, 2012. China likely hit the bottom of a seven-quarter long economic downturn between July and September, but the slowest three months of growth since the depths of the financial crisis and a cloudy housing market outlook make recovery prospects tepid.

A 656 feet dragon shaped lantern made with 10,000 pieces of porcelain including ceramic bowls, dishes, plates and cups releases smoke as locals visit the Shanghai International Lantern Festival.

A man covers an art piece by Beijing-based artist Chi Peng with paper after government officials from the cultural bureau deemed it unfit for display before the inauguration of the SH Contemporary Art Fair at the Shanghai Exhibition Center on September 6, 2012.

Workers cover an art piece after it was deemed unfit for display. Censorship of political content has long been a feature of the Chinese art world under Communist Party rule, but gallery owners and artists at SH Contemporary were told on Thursday that city officials were being extra careful ahead of a once-a-decade leadership transition set to take place in Beijing next month.

A view of the Oriental Pearl TV Tower, right, and downtown Shanghai seen through the haze on May 15, 2012.

Cleaners prepare to clean windows outside the 101st floor of the Shanghai World Financial Center March 26, 2012. More than 30 workers on the window-cleaning team of the skyscraper work in pairs every day. The cleaners have to obtain a license for high-rise operations and must not have high blood pressure or a fear of heights. They are not allowed items which could fall, such as cell phones or wristwatches, and must stop working in heavy winds.

Window cleaners outside the 101st floor of the Shanghai World Financial Center March 26, 2012.

Yang Bo cleans a window outside the 94th floor of the Shanghai World Financial Center March 26, 2012.