(EPA)will decide by late September 2007 whether to propose a new air-quality standard for lead.EPA issued the current air-quality standard for lead in 1978.The Clean Air Act requires the agency to review the standard every five years and issue new standards if it determines that they are ...
In particular, these groups cite studies that have linked air pollution to impacts associated with COVID-19. Eighteen states have already brought suit challenging EPA’s decision to retain the PM2.5 standard. Whether the Biden administration will work to reverse these decisions or simply restart ...
The January 2013 revisions change the existing (2006) annual health-based (“primary”) standard for “fine” particulate matter 2.5 micrometers or less in diameter (or PM2.5), lowering the allowable average concentration of PM2.5 in the air from the current level of 15 micrograms per cubic m...
revising the existingnational ambient air quality standards (NAAQS) by addinga new 5-minute standard of 0.60 ppm, 1 expectedexceedance; establishing a new regulatory program undersection 303 of the Clean Air Act to supplement theprotection provided by the existing NAAQS; and augmentingimplementation ...
The new rule would set the maximum allowable standard for soot in a range of 12 to 13 micrograms per cubic meter of air. The current annual standard is 15 micrograms per cubic meter. Administration officials said the proposed changes are consistent with advice from independent scientists and are...
Preliminary data from air quality monitors at two small airports in California show violations of the air quality standard for lead, according to the Envir... J Coomes - 《Environment Reporter》 被引量: 0发表: 2013年 Assessment Urges EPA to Consider Stronger Air Quality Standards for Carbon Mon...
17-23 The counterfactual concentration of 12 μg/m3 was selected as the most logical comparison because it represents the desired annual air quality standard. The excess ASCVD and pulmonary event rates per day due to PM2.5 exposure were calculated for each AQI at the lower thresh...
11.2 Calculate the total volume of air sampled as: Vstd = Q std×t where Vstd = total air sampled in standard volume units, std m 3 ; t = sampling time, min. 11.3 Calculate the PM10 concentration as: PM10 = (Wf?Wi)×10 6 /Vstd where PM10 = mass concentration of PM10, ?g/std ...
EPA's Office of Transportation and Air Quality protects public health and the environment by regulating air pollution from motor vehicles, engines, and the fuels used to operate them, and by encouraging travel choices that minimize emissions. These "mobile sources" include cars and light trucks, ...
Epa Proposes Updates To Air Quality Index, Significant-harm Level For Fine ParticlesThe Environmental Protection Agency released a proposed rule Jan. 15 to update the Air Quality Index for fine particulate matter, bringing it into con-formance with the air quality standard for the pollutant.rnThe...