Nov 07, 2017 frequently asked questions about wintertime pm2. Page, office of air quality planning and standards washington, dc. In the united states, pm concentrations are measured at many fixed air quality stations in monitoring networks managed by state, local, and tribal agencies to assess compliance with national ambient air quality standards naaqs for pm 2. The table includes federal register citations for each revision to the national ambient air quality standards naaqs for particulate matter pm. Table of historical particulate matter pm national ambient air quality standards naaqs history of the naaqs for particulate matter, from 1971 to 2012.
The revision of the no 2 naaqs in 2010 did not affect the secondary standard, which remains an annual standard with a level of 53 ppb. The national ambient air quality standards naaqs are set by the u. California ambient air quality standards california air. History of particulate matter pm and total suspended particles tsp. Rejecting thresholds and calculating benefits below the naaqs. Environmental protection agency, september, 20, page 4. Carbon monoxide is a colorless, odorless, nonirritating gas produced by vehicle exhaust.
Naaqs based on the severity of the ozone levels, pm2. This section provides detailed information about designations, classifications and the nonattainment area status for the pm2. Implementation, maintenance, and enforcement of the 2012 pm2. California law continues to mandate caaqs, although attainment of the naaqs has precedence over attainment of the caaqs due to federal penalties for failure to meet federal attainment deadlines. The epa recommends that the surface characteristics input to aermet should be representative of the land cover in the vicinity of. Definitions and classifications used in the study of air pollution are introduced. The smaller particle size may pose a higher risk for systemic cardiovascular effects. Epa plans to designate geographic areas as attaining or not attaining the 2006 24hour pm 2. Even a cursory look at the history of the naaqs and. Epa has set naaqs for six principal pollutants which our agency monitors. The apex pollution control body recorded 24 hourly average pm2. Effects of independence day fireworks on atmospheric.
Data from these monitors is uploaded to the epas air quality system database, which constitutes the official record of air quality data. Instead, it is to examine whether the nonattainment area is sensitive to increases of precursor emissions and whether the resulting pm2. The national ambient air quality standards naaqs are the concentrations of these principal pollutants, above which. Central pollution control board via moefcc on prediwali days, pm10 and pm2. Proposed rule june 9, 2014 79fr 32892 withdrawal of the prior determination or presumption that compliance with the cair or the nox sip call constitutes ract or racm for the 1997 8hour ozone and 1997 fine particle naaqs 27. Air quality designations for the 2012 primary annual fine. Epa no longer updates this information, but it may be useful as a reference or resource. Harnett director, air quality policy division office of air quality planning and standards may 6, 2008 nacaa spring meeting 1. Our analysis indicates that regional nox reductions are the most effective way to meet the current standard in most cities that are currently violating the ozone naaqs to better understand the effects of substantial emissions reductions on spatial and temporal patterns of ozone, we look at how ozone will change with 50% and 75% cuts in us. Thus, the caaqs predate the national ambient air quality standards naaqs set by the u. History of the national ambient air quality standards for particulate matter. Final regulatory impact analysis ria for the so2 national.
Environmental protection agency national center for environmental assessment office of research and development and office of air quality planning and standards office of air and radiation research triangle park, north carolina 27711. This comparison is done with massonly samplers which detect ambient concentrations of pm2. Epa, which was created in 1970, and issued its first naaqs in 1971. Both of the guidance documents refer readers to standard texts on. The table includes federal register citations for each revision to the national ambient air. Air quality analysis for fine particulate matter pm. Interim transportation conformity guidance for 2006 pm2.
History of primary naaqs for ozone and other photochemical oxidants. The second day of july 1776, will be the most memorable epocha, in the history of america. An extension to 2025 may be granted depending on the severity of an areas pm2. The monitoring information provided in the charts below. National ambient air quality standards naaqs, pronounced \naks\ are limits on. As a result, the epa believes that, for purposes of the pm2. This rule establishes air quality designations for most areas in the united states u. Table of historical particulate matter pm national.
The level of the annual standard is defined to one decimal place i. Established by the united states environmental protection agency epa under authority of the clean air act 42 u. A history of the us national ambient air quality standards. The table includes federal register citations for each revision to the national ambient air quality standards naaqs for particulate matter pm, and acceptable total suspended particles.
Designating nonattainment areas congressional research service summary on april 7, 2015, the environmental protection agency epa published amendments to the. Air quality analysis for fine particulate matter pm2. Environmental standards, thresholds, and the next battleground of. Oral history video early implementation of the clean air act of 1970 in california. Overview of ambientozone standards development and benefits.
National ambient air quality standards air quality agency. Table of historical pm naaqs history of the national ambient air quality standards for particulate matter during the period 19712012. During winter, the wasatch front suffers from multiday wintertime air pollution episodes in which the concentrations of aerosols or fine particulate matter with diameters less than 2. National ambient air quality standards naaqs were first established in the united states to protect public health and welfare, and the. Also introduced are a brief history of air pollution, its regulation, and trend s of its ambient concentration s and emissions. Units of measure for the standards are parts per million ppm by volume, parts per billion ppb by volume, and. The epa has set national ambient air quality standards for six principal pollutants, which are called criteria air pollutants. Parameter code parameter pollutant standard id pollutant standard short name pollutant standard description naaqs basis naaqs statistic primary standard level. Even a cursory look at the history of the naaqs and air pollution shows that. These benefits are incremental to an air quality baseline that reflects attainment with the 2008 ozone and 2006 pm2.
Ambient particulate matter pm has a variety of adverse effects on human health. The us environmental protection agency sets national ambient air quality standards naaqs for pm pm2. Several essays and books have been written about the legal, policy, societal. Federal register fine particulate matter national ambient. These estimates reflect epas most current interpretation of the scientific literature and are consistent with the methodology used for the proposal ria. Based on this report 1977 lead aqcd, the epa established a 1. The environmental protection agency epa is finalizing requirements that state, local and tribal air agencies would have to meet as they implement the current and future national ambient air quality standards naaqs for fine particulate matter pm2. Table of historical particulate matter pm national ambient. Transportation conformity applies for the naaqs for which an area is designated nonattainment.
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