A major episode of both fine particles and ozone (and likely other pollutants as well) occurred during the period July 16th and 17th, 1999 in the Northeastern US and Eastern Canada. It would be an interesting episode for further analysis. Anyone interested? Who has Data, Pictures or Ideas to contribute?
Power point slides posted on MARAMA's web site summarize an analysis of preliminary 1998 ozone data, which is also posted on MARAMA's web site. In 1998 ozone levels exceeded the 8-hour national ambient air quality standard much more often and in a much larger area than was true for the 1-hour standard. Links to the ozone map site facilite visualization of the worst days in 1998 for the Mid-Atlantic Region. Co-author Elena Belyaev, MARAMA student assistant.
by Original Author:
Wierman Susan
Here's a quick look at an ongoing analysis of (one or more) forest fire(s) which influenced air quality in New England and Eastern Canada during late August, 1995. Possible relevance to PM-10, PM-2.5, CO, PAMS and Hg.
There are many challenges with mapping ozone under EPA's new 8-hour ozone standard. The most important consideration is that real-time maps need to be able to represent elevated levels of ozone as they are occurring, not after the fact. The attached presentation highlights the challenges of mapping ozone under the new standard and proposes a methodology to deal with it using hypothetical values for the Pollutant Standards Index (PSI). The proposed methodology takes advantage of the strong relationship that exists between peak 1-hour concentrations and peak 8-hour concentrations. Utilizing this relationship allows for the creation of animations based on 1-hour ozone data that project what the 8-hour averages are likely to be. This technique used in conjunction with the new Pollutant Standards Index (PSI) that EPA is developing for the new ozone standard, will allow for the creation of animations that are both understandable and informative to the viewer.
by Original Author:
Conroy David
Submitted by
Conroy David
on
12/16/97
RecID:
NEARDAT.Reports.Fragments.DavidConroy
This report fragment discusses ground-level ozone trends in the DC area and a relationship between between 1-hr exceedances and peak daily temperatures.
by Original Author:
Bloom Bernie
Daily 24 hr PM2.5, PM10 and sulphate measurements at two sites in rural eastern Canada are stratified according to back-trajectory positions. This analysis indicates what the average concentrations are of PM2.5, PM10 and SO4 when airmasses originate over the U.S. versus over Canada. Particle concentrations advected into Canada from the U.S. are often above the levels being considered for new Canadian Objectives and the average concentration is close to the new U.S. annual PM2.5 Standard.
by Original Author:
Brook Jeff
Submitted by
Brook Jeff
on
12/3/97
RecID:
NEARDAT.Reports.Fragments.JeffBrook
This is a follow-up on Al Lleston's "report fragment" on 1-hr and 8-hr ozone trends in CT. It seems like CT and upwind areas have been doing something right. What is it?
Examination of the annual number of ozone exceedance days in Connecticut indicates that the 8-hour ozone standard is more stringent (more exceedance days/year) in Connecticut than the 1-hour standard. Historically however, reductions in exceedance days/year for the 8-hour standard have been greater than for 1-hour exceedances, so that adoption of the 8-hour standard may not delay the projected attainment date in Connecticut, provided that these trends continue. We are curious if similar(or contrasting) patterns have been observed elsewhere?
