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it is necessary to monitor the cox and nox in the air as environmetal parameters such as temperature, humidity and wind directly interact with co2 and no2 to form poisonous pollutants such as acidic solution that can damage constructing material and also human health. they can react with greenhouse gasses to form other pollutants.
The real concern at a construction site is the particulate matter with diameter 10 microns, but COx and NOx are less important unless there is a heavy fossil fuel machine use. but it's pretty important to conducts air dispersion modeling for all pollutants from the site, especially if it located among residential area.
