Environment of Pakistan
The Air pollution is the release of chemicals and particulates into the atmosphere. Common gaseous pollutants include carbon monoxide, sulfur dioxide, chlorofluorocarbons (CFCs) and nitrogen oxides produced by industry and motor vehicles. Photochemical ozone and smog are created as nitrogen oxides and hydrocarbons react to sunlight. Particulate matter, or fine dust is characterized by their micrometre size PM to PM. The air in Karachi is rapidly polluted by automobile smoke, especially Rickshaws and Buses, industrial emissions, open burning of garbage, house fires, and other particles but the government and environment organizations seems non-serious to tackle the issue timely.
The two-stroke engines on rickshaws and motorcycles are one of the major polluters of air in Karachi and the rest of Pakistan. The two-stroke engines as well as defective or unturned vehicles are major polluters with carbon dioxide emissions. Two-stroke engines as well as defective vehicles using substandard lubricant are major emitters of sulfur dioxide and smoke. Automobiles operating on compressed natural gas and liquefied petroleum gas are major air polluters.
2013 Northeastern China smog
Air pollution in Chinese cities is of increasing concern to China's leadership. Particulates in the air can adversely affect human health and also have impacts on climate and precipitation. Pollution from the burning of coal has reduced life expectancies by 5.5 years in the north of China, as a result of heart and lung diseases. According to the National Environmental Analysis released by Tsinghua University and The Asian Development Bank in January 2013, 7 of 10 most air polluted cities in the world are located in China, including Taiyuan, Beijing, Urumqi, Lanzhou, Chongqing, Jinan and Shijiazhuang. As air pollution in China is at an all-time high, several northern cities are among one of the most polluted cities and has one of the worst air quality in China. Reporting on China's airpocalypse has been accompanied by what seems like a monochromatic slideshow of the country's several cities smothered in thick smog. According to a survey made by "Global voices China" in February 2013, China's 10 most polluted cities on the blacklist includes major Chinese cities like Beijing, Jinan, Shijiazhuang, Zhengzhou, and 6 other prefectural cities all in Hebei Province. These cities are all situated in traditional geographic subdivision of North China.