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Results 1 - 10 from 165 for ground level concentrations in 0.439 sec.

GAIA Model Base SHORTZ: Short Term Dispersion Model
Model SHORTZ: Short Term Dispersion Model DESCRIPTION The air quality model SHORTZ uses a simple gaussian plume formulation to evaluate ground level concentrations due to up to 300 point and area sources in urban and rural areas with flat or complex terrain conditions. It may include sedimentation and works on short time intervals (1,2, 3 hours). ...
www.ess.co.at

Mike Lyons & Associates Pty Ltd Environmental Consulting Chemists
The emission ... the difference between acceptance and rejection of an application. To see if the calculated ground level concentrations are below the statutory limits, check with your local authority. In Victoria, these limits ...
mikelyons.com.au

AirQUIS: EPISODE Model (long description)
AirQUIS by defining the background concentration to be dependent upon one or more background (regional) measurement values. Other input requirements None. Output quantities Hourly ground level concentrations and dry and wet deposition values for each pollutant and for each grid location and individual receptor point User interface availability User interface through NILUs AirQUIS ...
nilu.no

Air Pollution Dispersion
Elevated emissions, however, such as those released from a chimney, are returned more readily to ground level, leading to higher ground level concentrations. Stable conditions mean less atmospheric mixing and therefore higher concentrations around ground level sources, but better dispersal rates, and therefore ...
www.enviropedia.org.uk

OzoneNY - Ground-level Ozone - how it's created
This is a day when people should avoid being outside. High ozone concentrations usually occur in the early afternoon and continue into early evening from May through September. Ozone alerts are announced by the New York State Department of Transportation when ground-level ozone concentrations are forecast to be unhealthful. Click here to sign up for Ozone Alerts. On ...
www.ozoneny.org

Mobile laboratory in areas of maximum concentrations
Impact from elevated point sources is often difficult to measure at one point at ground level because both wind direction and wind speed, and their variation with height is important for ... proportional to the volume of traffic. Time-series of hourly concentrations should reflect the pattern of traffic intensity. The highest concentrations for 24-hour periods should be expected to be located ...
nilu.no

Ground-level Ozone (Smog) Information | New England | US EPA
VOCs and oxides of nitrogen (NOx) in the presence of sunlight. Ozone concentrations can reach unhealthful levels when the weather is hot and sunny with little or no wind. ... reduce pollution. Sign up for EPA's Air Quality Alert The Ozone Problem High concentrations of ozone near ground level can be harmful to people, animals, crops... more Daily Air Quality Index Real- ...
epa.gov

Air Quality Alert Program | Ground-level Ozone | New England | US EPA
Air Quality Alerts Issued? Air Quality Alerts are issued in the late afternoon when ground-level ozone and/or fine particle concentrations are predicted to be elevated on the following day in your area. ... , New Hampshire, Rhode Island, Vermont, & Tribal Nations Local Navigation EPA NE Home A-Z Index Ground-level Ozone (Smog) Home The Ozone Problem Air Quality Health Effects (EPA HQ) Real-time Air ...
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What effect does smog (ground level ozone) have?
Ground level ozone is also known to cause increased susceptibility of asthmatics to common allergens, and an ... has one of the most stringent air quality objectives for ozone with a maximum acceptable level of 82 parts per billion (ppb) over a one hour period. Graph showing increase in ...
www.ns.ec.gc.ca

What is the trend of ozone concentrations in Atlantic Canada?
(New Brunswick) Severe Weather Awareness Wildlife Atlantic Region Wildlife and Nature Environmental Protection Meteorology Community Programs Hurricane Centre Media Room Climate Change Climatology studies of ground level ozone concentrations in the Atlantic region, carried out by the Atmospheric Science Division in Dartmouth, Nova Scotia, indicate that elevated readings are often reported in the ...
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