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This is the list of extremely hazardous substances defined in Section 302 of the U.S. Emergency Planning and Community Right-to-Know Act (42 U.S.C. § 11002). The list can be found as an appendix to 40 CFR 355. [1] Updates as of 2006 can be seen on the Federal Register, 71 FR 47121 (August 16, 2006). [2]
Many gases have toxic properties, which are often assessed using the LC 50 (median lethal concentration) measure. In the United States, many of these gases have been assigned an NFPA 704 health rating of 4 (may be fatal) or 3 (may cause serious or permanent injury), and/or exposure limits (TLV, TWA/PEL, STEL, or REL) determined by the ACGIH professional association.
From 1967 to 2017, these symbols were used for labeling containers and piping systems containing dangerous substances/mixtures. These symbols could also be used to identify areas where dangerous substances/mixtures were being stored in large quantities, as an alternative to the yellow triangular Directive 92/58/EEC warning signage.
[2] [3] Deaths from choking most often occur in the very young (children under three years old) and in the elderly (adults over 75 years). [4] [5] Foods that can adapt their shape to that of the pharynx (such as bananas, marshmallows, or gelatinous candies) are more dangerous. [6] Various forms of specific first aid are used to address and ...
A pulmonary agent, or choking agent, is a chemical weapon agent designed to impede a victim's ability to breathe. Such compounds operate by causing a build-up of fluids in the lungs, which then leads to asphyxiation. Exposure of the eyes and skin tends to be corrosive, causing blurred vision and severe deep burns.
The geographical extent of sources may be very large. For example, up to one-sixth of China's arable land might be affected by heavy metal contamination. [23] Lead is the most prevalent heavy metal contaminant. [24] As a component of tetraethyl lead, (CH 3 CH 2) 4 Pb, it was used extensively in gasoline during the 1930s–1970s. [25]
A universal sign of choking has been designated as a silent indication from a person who is unable to breathe, and consists of placing both hands on one's own throat while trying to attract the attention of others who might help. [13] The man on the right is performing the universal sign of choking by placing both hands on his throat.
For choking children less than 1 year of age, the child should be placed face down over the rescuer's arm. [21] Back blows should be delivered with the heel of the hand, then the patient should be turned face-up and chest thrusts should be administered. [ 21 ]