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.
Barranquilla
Under wind, atmospheric pollutants move in a north and northeasterly direction, and in times of low winds or moderate winds, are more evenly distributed over the city. The most polluting industrial processes in the city are ammonium sulfate, cement, plaster and paper pulp. The emission of gases from motor vehicle traffic is more critical in the central district, where much of the business is. The main source of air pollution is from the vehicles at 34% and then industry with 18%. The pollutants emitted by vehicles are carbon monoxide (89.12%), sulfur dioxide (0.23%), hydrocarbons (6.46%), oxides of nitrogen (3.82%) and other particles (0. 37%). To help remedy this problem, several state enterprises and private sector have supported a project to convert liquid fuel vehicles to natural gas. Furthermore, the city has installed more than 12 service stations catering to natural gas vehicles. Barranquilla is the fourth biggest atmospheric polluter from industry. According to research conducted by the Institute of Hydrology, Meteorology and Environmental Studies of Colombia (IDEAM), monthly concentrations in Barranquilla of particulate matter smaller than 160 micrograms per cubic meter exceeds the highest international standard allowed of 70. The causes of this problem lie heavily on the poor quality of petrol and diesel used by vehicles of the city, with record levels of 5,000 ppm (parts per million sulfur) and 4,500 ppm respectively, when there are countries whose rates do not even exceed 50.