Dr. David Yap

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  www.nowtoronto.com/issues/2007-04-26/news_cityinbrief2. - [Cached Version]
  Published on: 4/26/2007    Last Visited: 4/26/2007  

  Dave Yap, senior science adviser for the MOE, says, "By the time we would have issued the warning, the hour would have been over."The MOE, he says, doesn't want to panic people.

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  www.cleanairalliance.org/media/oct1802.html - [Cached Version]
  Published on: 1/1/1998    Last Visited: 1/26/2008  

  "This year was a record-breaking year for parts of Ontario in terms of smog advisories," said David Yap, co-ordinator of air quality and meteorology for the provincial Ministry of the Environment.
  
  "Whenever we get a flow from the south or southwest into Ontario, this invariably causes high readings as far as Hamilton and Toronto."
  
  The transported pollution increases the closer one lives to the border; in Windsor, it accounts for about 90% of the contaminants in the air, he said.

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  www.thepioneer.com/?q=node/4015 - [Cached Version]
  Last Visited: 3/28/2009  

  North America's vast freshwater lakes facilitate the transfer of smog into Ontario's southeastern regions, something known as fumigation on the lake, says David Yap, senior science advisor of air quality and meteorology for the Ontario Ministry of the Environment in Toronto. "When heavily polluted air is coming in from the U.S., it's very stable, and doesn't disburse much, partly because the temperature of the lake is constant. When it comes ashore, it tends to keep slightly higher in elevation, but the temperature of the land lowers it rapidly to ground level," says Yap. "Because Belleville is located close to the north shore of Lake Ontario, it's one of the areas getting all the flow coming up from the U.S., where a large contribution of the precursors for smog is coming from." Smog season typically occurs in Ontario during peak summer months, when heat and sunlight spark a chemical reaction at the earth's surface between nitrogen oxides (NOx) and volatile organic compounds (VOC) - comprised of emissions from motor vehicles, electrical utilities, gasoline vapors, chemical solvents and factory emissions - that generates a harmful air pollutant called ground-level ozone, the main component of smog, alongside particulate matter, said Yap. "They're far away, but when you look upwind of Belleville, there are hundreds of power plants covering the American Midwest, and during summer, that's a large contributor to all the smog and chemical conversions that we see producing ground-level ozone in Ontario," says Yap. "Our understanding is that it takes a lot of reductions of those sources in the U.S. to get significant benefits in Ontario." Reducing trans-boundary air pollution begins at home, says Yap, where the Ontario government has pledged to abolish coal-burning power plants by 2014, and it implemented Drive Clean, a mandatory emissions test for all road vehicles in Ontario. "That's where we're impacting some of the big emission factors in Ontario. Not to say trans-boundary smog isn't important, because it's causing a lot of health problems here, but at the same time, we know our own sources of pollution, and we are addressing those sources in Ontario, so we can't ask people in the U.S. to cut back if we're not doing our own homework as well," says Yap.

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  toronto.ieee.ca/events/feb0906.htm - [Cached Version]
  Last Visited: 8/12/2009  

  Dr. David Yap, Senior Scientific Advisor, Air Quality & Meteorology Ontario Ministry of the Environment
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  Dr. David Yap is Senior Scientific Advisor on Air Quality and Meteorology with the Ontario Ministry of the Environment. He is the ministry's scientific spokesperson on smog.

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  www.signesvitauxcanada.ca/news-rogers-f.html - [Cached Version]
  Published on: 10/6/2006    Last Visited: 4/7/2007  

  Yet, while the report flags the air and river water quality as areas of concern, David Yap, an air pollution scientist with the Ontario Ministry of Environment, says Ottawa smog levels vary with the weather, but have remained about the same for years.He says in fact that the was Ontario measures smog has changed.

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  www.mirror-guardian.com/to/newscentre/story/542188p-668 - [Cached Version]
  Published on: 9/2/2002    Last Visited: 9/2/2002  

  With the addition of PM2.5 monitoring, Dr. David Yap, co-ordinator of air quality and meteorology with the Ministry of the Environment, said there is a likelihood of a 10 per cent increase in smog advisories, as well as the issuance of year-round advisories.
  
  "There may be a day or two in the winter with widespread stagnation and get the accumulation of fine particles.Ozone is not a problem in the winter because it's photochemically driven during the summer with higher temperatures and high-intensity sunlight.
  
  SMOG WINDOW
  
  Our smog window is May 1 to Sept. 30.
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  Particles are 2.5 microns in diameter, 25 times less than the diameter of a human hair, Yap said.
  
  36 MONITORING STATIONS
  
  Twenty-eight of the province's 36 air quality monitoring stations -- most located in near the U.S. border in southern Ontario -- monitoring PM2.5.

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  www.hamiltonspectator.com/breakingnews/breakingnews_825 - [Cached Version]
  Published on: 3/27/2007    Last Visited: 3/27/2007  

  David Yap, air quality co-ordinator for the Ontario Ministry of the Environment, blamed the situation on air on the Mountain being much warmer than the lake water, but said it was already improving shortly after 2 and predicted "it will be over downtown in the next hour."
  
  Yap said it was the first incidence of poor air quality in the city so far this year.

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  www.wellandtribune.ca/ArticleDisplay.aspx?e=1121900 - [Cached Version]
  Published on: 7/19/2008    Last Visited: 7/19/2008  

  Niagara has had only eight smog alert days in 2008, said Dave Yap, an air quality specialist with the environment ministry.
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  Short-term smog relief could be in store today and Niagara's smog will likely "ease off" this weekend, Yap said.

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  www.thepeterboroughexaminer.com/ArticleDisplay.aspx?e=1 - [Cached Version]
  Last Visited: 6/8/2008  

  The city's air quality jumped into the poor index around 4 p. m. with a reading of 55, said Dave Yap, senior scientific advisor for air quality and meteorology for the Ministry of the Environment.
  
  "It's only temporary.There is no smog advisory," he said.
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  Air quality shouldn't be a problem over the weekend, Yap said.

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  A smog alert on Earth Day? | Ontario Clean Air Alliance - [Cached Version]
  Published on: 4/25/2007    Last Visited: 2/7/2009  

  Dave Yap, senior science adviser for the MOE, says, "By the time we would have issued the warning, the hour would have been over." The MOE, he says, doesn't want to panic people.

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