Members of the country's top political consultation body can breathe a sigh of relief - Beijing's air quality has been graded "good" for Tuesday's session of the annual Chinese People's Political Consultative Conference. When members from the Henan provincial delegation arrived in Beijing on Sunday, the first thing they did was check the air quality index, state news agency Xinhua reported. Marring the good news was a sandstorm forecast to hit parts of Xinjiang , Inner Mongolia , Gansu and Ningxia . Smog is expected to once again come under scrutiny at the session, after former state television presenter Chai Jing's documentary about air pollution, titled Under the Dome , went viral online over the weekend. The documentary has been the focus of huge public attention, and attracted both supporters who cheered her courage, and critics, who blamed her for stopping short of what they see as the root cause of the problem - a government with unchecked power. Many people hope the documentary can help prompt greater efforts by government agencies and industry to tackle the problem. For all the latest news from China’s parliamentary sessions click here Ninety per cent of the 161 cities where air quality was monitored in 2014 failed to meet official standards, according to a National Bureau of Statistics report published last week. Chen Jining , the new environmental minister, vowed on the weekend to strengthen the implementation of environmental law. "In the past, environmental laws have been enforced leniently by some departments. Failing to abide by the law has become normal," Chen was quoted by China Radio International as saying. But this could no longer be the case, Chen said. "Both companies and governments need to observe the law, which shouldn't be viewed as a difficult requirement. If they can't abide by the law, then how can we count on them to protect the environment?" Chen's deputy Pan Yue , once known for his outspokenness, said yesterday that the ministry had fined 15 companies some 7.23 million yuan (HK$9 million) for violations since the revised environmental law came into force in January. The new law imposes much harsher fines for violators. He also pledged that environmental protection departments would implement the revised law with "iron fists".