Agricultural air pollution comes mainly in the form of ammonia, which enters the air as a gas from heavily fertilized fields and livestock waste. The aerosols form mainly downwind of farming areas, in densely populated places where farm emissions combine through a series of chemical reactions with those of cars, trucks and other sources. Bauer says that if future industrial emissions go down, much farm-produced ammonia will end up in earth’s troposphere, roughly 2 to 10 kilometers from the surface. However, the study is perhaps the first to look at the phenomenon worldwide, and to project future trends. We will definitely use Superior Air Duct & Dryer Vent Cleaning in the future and recommend to our friends and family. The good news: if industrial emissions decline in coming decades, as most projections say, fine-particle pollution will go down even if fertilizer use doubles as expected. Fabien Paulot, an atmospheric chemist with Princeton University and the National Oceanic and Atmospheric Administration who was not involved in the study, said, “You might expect air quality would decline if ammonia emissions go up, but this shows it won’t happen, provided the emissions from combustion go down.” That means that pollutants other than ammonia should probably be targeted for abatement, he said.

For other substances, see Density and specific weight o acetone , ammonia , argon , benzene , butane , carbon dioxide , carbon monoxide , ethane , ethanol , ethylene , helium , hydrogen , methane , methanol , nitrogen , oxygen , pentane , propane , toluene and water , as well as Density of crude oil , Density of fuel oils , Density of lubricating oil and Density of jet fuel as function of temperature. Hydrogen – Thermal Conductivity vs. Online calculator, figures and table showing thermal conductivity of hydrogen, H2, at varying temperature and pressure – Imperial and SI Units. Online calculator, figures and table showing thermal conductivity of methane, CH4, at temperatures ranging from -160 to 725 °C (-260 to 1300 °F) at atmospheric and higher pressure – Imperial and SI Units. Online calculator, figures and tables showing thermal conductivity of liquid and gaseous propane at varying temperarure and pressure, SI and Imperial units. Tabulated values and density units conversion are given below the figures . Download and print Air – Density vs. From the table above – the density of air is 1.205 kg/m3 at 20 oC .

From the table above – the density of air is 1.205 kg/m3 at 20 oC. The output density is given as kg/m3, lb/ft3, lb/gal(US liq) and sl/ft3 . The calculator below can be used to calculate the air density and specific weight at given temperatures and atmospheric pressure. Specific weight is given as N/m3 and lbf / ft3. Psychrometric table with humid air properties like saturation pressure, specific volume, enthalpy and entropy. See also Air Composition and molecular weight , Density at varying pressure , Diffusion Coefficients for Gases in Air , Dynamic (absolute) and kinematic viscosity , Prandtl Number , Specific heat at varying temperature and Specific heat at varying pressure , Thermal Conductivity , Thermal Diffusivity , Properties at gas-liquid equilibrium conditions and Air thermophysical properties , for other properties of air . Properties of the US standard atmosphere ranging -5000 to 250000 ft altitude. Here are our current favorite water bottles for cycling-all of which will fit into a standard bottle cage.

Most projections say that tighter regulation, cleaner sources of electricity and higher-mileage vehicles will cut industrial emissions enough by the end of this century that farm emissions will be starved of the other ingredients necessary to create aerosols. The culprit: fumes from nitrogen-rich fertilizers and animal waste that combine in the air with industrial emissions to form solid particles-a huge source of disease and death. The new study is not the first to flag agricultural pollution; many regional studies, especially in the United States, have shown it as a prime source of fine-particulate precursors. “The article underscores that all source categories should be controlled,” he said. A new study says that emissions from farms outweigh all other human sources of fine-particulate air pollution in much of the United States, Europe, Russia and China. The fact that agricultural emissions must combine with other pollutants to make aerosols “is good news,” said Bauer. “One should be cautious about suggesting that food production could be increased” without increasing pollution, he said because that “critically depends” on the assumption that societies will successfully curb industrial emissions. Lelieveld cited the recent scandal over Volkswagen’s fraudulent auto-emissions controls, and pointed out that even with the recent reductions in industrial pollution, most nations including the United States still have large areas that exceed the World Meteorological Organization’s recommended maximum of 10 micrograms of fine particulates per cubic meter.