pm2.5 Articles

  • A practical guide to PM2.5

    By now you’ve likely heard about U.S. EPA’s final rules governing the implementation of the New Source Review (NSR) program for fine particulate matter (i.e., particulate matter with an aerodynamic diameter less than 2.5 microns, or PM2.5). ALL4 published two articles in 2008 addressing specific aspects of the PM2.5 NSR rule. ALL4 has since formally established a PM2.5 Team to ...


    By All4 Inc.

  • PM2.5 Air Quality Modeling Updates

    There has been much activity over the past six (6) months that will impact how air quality modeling analyses will be conducted for Prevention of Significant Deterioration (PSD) permit applications with respect to particulate matter less than 2.5 microns (PM2.5).  As the resident air quality modeling expert at ALL4, I thought it ...


    By All4 Inc.

  • Is it time to upgrade the PM2.5 federal reference method?

    The fine particulate matter (PM2.5) Federal Reference Method (FRM) has in many respects been a great success. When the method was implemented, there was some doubt that the state and local monitoring agencies that routinely provide air quality data would be able to manage a program, which often distinguishes one location from another by just a few μg/m3. As it turns out, data from the FRM ...

  • EPA shifts PM2.5 PSD permitting policies

    On August 12, 2009, EPA created a significant stir in the regulated community when it issued an order that signals a significant shift in how the agency intends particulate matter with a diameter less than 2.5 micrometers (PM2.5) emissions to be regulated under the Prevention of Significant Deterioration (PSD) program. The order specifically applied to petitions filed by environmental groups ...


    By Trinity Consultants

  • Performance characterization of the MiniVol PM2.5 Sampler case study

    Measurements were conducted to assess the MiniVol PM2.5 sampler performance for various particle preseparator configurations including flat and cup impaction stages. Laboratory measurements were conducted to determine the impactor collection efficiency as a function of paricle size. Impactor cut points - the aerodynamic particle diameter exhibiting 50% collection efficiency - were 2.5 um (+- 10%) ...


    By Airmetrics

  • 5 Processes Where Quality and EHS Convergence Makes Complete Sense

    There are also many overlaps between the quality standards such as ISO 9001, ISO 14001 and EHS standards such as OHSAS 18001. As businesses look to find greater efficiencies by streamlining and integrating business processes, as well as get a better return on their IT investments, quality and EHS convergence makes sense.  Forward-looking businesses are already finding areas ...


    By EtQ, LLC

  • Scavenging of PM2.5 by precipitation and the effects of precipitation pattern changes on health risks related to PM2.5 in Tokyo, Japan

    Fine particulate matter (aerodynamic diameter <2.5 μm; PM2.5) poses risks to human health. While precipitation is the main process for decreasing ambient pollutant concentrations, scavenging of PM2.5 by precipitation remains to be investigated. Here we formulated the processes of PM2.5 scavenging by precipitation from observed PM2.5 concentrations ...


    By IWA Publishing

  • Recent Federal Developments

    TSCA/FIFRA EPA Extends Comment Period For Draft Guidance For Pesticide Registrants On Notifications, Non-notifications, And Minor Formulation Amendments: On October 5, 2017, the U.S. Environmental Protection Agency (EPA) issued a notice of extension of the comment period for the draft guidance  ...


    By Bergeson & Campbell, P.C.

  • 5 Key elements to look for in your etch process

    High wafer throughput Fast etch rates and low clean overheads mean higher tool uptime. Higher uptime means more wafers through your fab Profile control Vertical facets means higher device efficiency – more light out for power in Smooth surfaces Smooth surfaces means less light scattering – more usable ...


    By Oxford Instruments plc

  • How do you make one of Europe’s largest cold spaces energy efficient?

    When you want to build one of Europe’s largest cold spaces, how do you ensure that energy efficiency is at the heart of the project?   That was the challenge facing AGRO Merchants Group when they set about expanding their chilled storage area in Rotterdam port by adding 18,000 pallets of chilled space to the market.   Located at the heart of Europe, Rotterdam port is ...


    By Kingspan Environmental Ltd

  • Nitro Beer Tastes Better

    If you've ever remarked on the smooth creaminess of a pint of Guinness, you've picked up on the key difference in its carbonation: Nitrogen rather than carbon dioxide. Such "nitro" beers have become a trend in recent years, with major U.S. breweries and small startups alike offering nitro products. Nitrogen keeps bitterness in check and balances out the hops to make drinkable craft brews, but it ...

  • What are the main indicators of water quality?

    “Water is the driving force of all nature;” so said Leonardo da Vinci. The survival of our planet depends on the availability of water and the condition that it is in. It is therefore vital to make sure that it is able to provide a hospitable environment for those that live in it, and is free from harmful levels of substances for those that drink it. Not ...


    By Aquaread Limited

  • Fine Particulate Series: PM2.5 nonattainment — What you need to know

    In the March 2009 4 The Record article “A Practical Guide to PM2.5,” ALL4’s PM2.5 Team discussed the technical basics of PM2.5 and the specific steps that you can take to assess your position with regard to the challenging regulatory landscape that lies ahead. This month’s article aims to fill in a few technical details regarding PM2.5 nonattainment areas, including a ...


    By All4 Inc.

  • Characteristics of PM2.5 in rural areas of southern Jiangsu Province, China

    To understand pollution level and possible sources ofatmospheric fine particulates in rural areas of southern Jiangsu Province of China, samples of PM2.5 were collected and analyzed in Xueyan Town and Taihu Lake Station over three seasons from July 2002 to January 2003. The mass concentrations of PM2.5 and 14 principal component elements were obtained. The results showed that pollution of PM2.5 ...


    By IOS Press

  • CCS vs. Electrostatic Precipitators for Abrasives, Ceramics, Non-Soluble PM2.5, Submicron Particulate

    Manufacturing Processes. Applications where conventional equipment is very inefficient or very expensive to operate and maintain provides an opportunity for the Cloud Chamber Scrubber (CCS) to showcase its unique capabilities. Abrasives manufacturing is a typical example. CCS Cloud Chamber technology was chosen by Saint-Gobain Advanced Ceramics Corp. (formerly Carborundum Corp.) for the ...


    By Tri-Mer Corporation

  • Fine Particulate Series (Part 3): PM2.5 prevention of significant deterioration (i.e., Attainment) – What you need to know

    U.S. EPA’s final rules (and policies) governing the implementation of the New Source Review (NSR) program for fine particulate matter (i.e., particulate matter with an aerodynamic diameter less than 2.5 microns, or PM2.5) are now being implemented. In the March 2009 issue of 4 The Record, ALL4’s PM2.5 Team discussed the technical basics of PM2.5. Then, in the April 2009 issue, ...


    By All4 Inc.

  • Universal system for forecasting changes in PM10 and PM2.5 particulate matter air pollution concentration

    We present a system for forecasting the changes in PM 10 and PM 2.5 particulate matter air pollution concentration. The system is based on immissions data from automatic measurement stations of the Voivodship (Regional) Inspectorate for Environmental Protection in Warsaw (Poland) and a numerical forecast of meteorological parameters from the Interdisciplinary Centre for ...


    By Inderscience Publishers

  • Source apportionment of PM2.5 in urban areas using multiple linear regression as an inverse modelling technique

    One method to assess the source contribution of particulate matter to urban air quality is through inverse modelling where emissions are estimated using dispersion models and monitoring data. In this paper, a straightforward inverse modelling method, using Multiple Linear Regression, is described and applied to the urban area of Oslo for PM2.5. The results of the inverse ...


    By Inderscience Publishers

  • Implications for UK coal-fired power stations of a move to a particulate matter standard based on PM2.5

    The contribution of UK coal-fired power stations to ambient PM2.5 concentrations has been assessed using short- and long-range modelling. The results suggested a minimal contribution from power stations to both local and regional concentrations of PM2.5 relative to the standards in the proposed European ...


    By Inderscience Publishers

  • `Challenges Facing Facilities in 8-Hour Ozone and/or PM2.5 Nonattainment Areas,` presented at the 2005 TAPPI Environmental conference

    Abstract In 2004, U.S. EPA finalized designations under the 8-hour ozone standard and the fine particulate matter :'PM:...) standard. With respect to the 3-hour ozone standard, 474 counties or partial counties were designated as nonattainment, while 30 areas volunteered to enter Early Action Compacts (EAC). U.S. EPA designated 40 areas comprised of 210 counties and the District of Columbia ...


    By Trinity Consultants

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