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Toxic: a chemical that has a median lethal concentration (LC 50) in air of more than 200 parts per million (ppm) but not more than 2,000 parts per million by volume of gas or vapor, or more than 2 milligrams per liter but not more than 20 milligrams per liter of mist, fume or dust, when administered by continuous inhalation for 1 hour (or less if death occurs within 1 hour) to albino rats ...
Road dust consists of deposits of vehicle and industrial exhaust gas, particles from tire and brake wear, dust from paved roads or potholes, and dust from construction sites. Road dust is a significant contributor to the generation and release of particulates into the atmosphere. [ 9 ]
Gas-phase soot contains polycyclic aromatic hydrocarbons (PAHs). [1] [18] The PAHs in soot are known mutagens [19] and are classified as a "known human carcinogen" by the International Agency for Research on Cancer (IARC). [20] Soot forms during incomplete combustion from precursor molecules such as acetylene.
Humans are not alone in suffering from lead's effects; plants and animals are also affected by lead toxicity to varying degrees depending on species. [133] Animals experience many of the same effects of lead exposure as humans do, such as abdominal pain, peripheral neuropathy , and behavioral changes such as increased aggression. [ 57 ]
A 16-part assessment of methane leakage from natural gas production initiated by the Environmental Defense Fund [39] found that fugitive emissions in key stages of the natural gas production process are significantly higher than estimates in the EPA's national emission inventory, with a leakage rate of 2.3 percent of overall natural gas output.
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Human-produced aerosols such as particle pollution tend to have a smaller radius than aerosol particles of natural origin (such as windblown dust). The false-color maps in the map of distribution of aerosol particles on the right show where there are natural aerosols, human pollution, or a mixture of both, monthly.
"The Christmas gas," she replies, hardly able to contain her laughter. "It was a green handle instead of black." "I’ll kill you," Clayton Crawford told his wife. "You better go run that car off ...