What are acceptable NO2 levels?
EPA set a 1-hour NO2 standard at the level of 100 parts per billion (ppb). EPA also retained the annual average NO2 standard of 53 ppb. The 1-hour standard will protect public health by limiting people’s exposures to short-term peak concentrations of NO2 – which primarily occur near major roads.
What is the current US allowable level Naaqs for NO2?
100 ppb
NAAQS Table
| Pollutant [links to historical tables of NAAQS reviews] | Level |
|---|---|
| Carbon Monoxide (CO) | 35 ppm |
| Lead (Pb) | 0.15 μg/m3 (1) |
| Nitrogen Dioxide (NO2) | 100 ppb |
| 53 ppb (2) |
Are nitrogen oxides regulated under Naaqs?
The Clean Air Act requires EPA to set national ambient air quality standards (NAAQS) for nitrogen oxides and five other pollutants considered harmful to public health and the environment (the other pollutants are ozone, particulate matter, carbon monoxide, sulfur dioxide, and lead).
What is the annual ambient air quality for NO2?
53 ppb
The official level of the annual NO2 standard is 0.053 ppm, equal to 53 ppb, which is shown here for the purpose of clearer comparison to the 1-hour standard. The form of the 1-hour standard is the 3-year average of the 98th percentile of the yearly distribution of 1-hour daily maximum NO2 concentrations.
How can I reduce my NO2 emissions?
These emissions can be reduced by making process changes (such as modifications to the combustion process) or by installing air pollution control equipment (such as selective non-catalytic reduction (SNCR) or selective catalytic reduction (SCR)).
What is the current legal limit for NO2 in the air in the UK?
40 µg/m3
The Air Quality Standards Regulations 2010 require that the annual mean concentration of NO2 must not exceed 40 µg/m3 and that there should be no more than 18 exceedances of the hourly mean limit value (concentrations above 200 µg/m3) in a single year.
How is NO2 being regulated?
The Clean Air Act regulates nitrogen dioxide as a criteria pollutant. The U.S. EPA sets National Ambient Air Quality Standards (NAAQS) for nitrogen dioxide, including both primary standards to protect public health and secondary standards to protect the environment.
Can you smell nitrogen dioxide?
Nitrogen dioxide is reddish-brown with a very harsh smell at high concentrations, at lower concentrations it is colorless but may still have a harsh odour. Nitrogen dioxide poisoning depends on the duration, frequency, and intensity of exposure.
What is the NAAQS for NOx?
The NAAQS for nitrogen oxides are a 1-hour standard at a level of 100 ppb based on the 3-year average of 98th percentile of the yearly distribution of 1-hour daily maximum concentrations, and an annual standard at a level of 53 ppb.
What are the primary and secondary standards for NAAQS table?
NAAQS Table. Primary standards provide public health protection, including protecting the health of “sensitive” populations such as asthmatics, children, and the elderly. Secondary standards provide public welfare protection, including protection against decreased visibility and damage to animals, crops, vegetation, and buildings.
When did the NO2 standard come into effect?
(2) The level of the annual NO2 standard is 0.053 ppm. It is shown here in terms of ppb for the purposes of clearer comparison to the 1-hour standard level. (3) Final rule signed October 1, 2015, and effective December 28, 2015.
What are national ambient air quality standards for nitrogen oxides?
The NAAQS for nitrogen oxides are a 1-hour standard at a level of 100 ppb based on the 3-year average of 98th percentile of the yearly distribution of 1-hour daily maximum concentrations, and an annual standard at a level of 53 ppb. 04/6/2018 – Review of the National Ambient Air Quality Standards for Oxides of Nitrogen, Final Decision
When was the NAAQS table last updated by the EPA?
NAAQS Table. The Clean Air Act, which was last amended in 1990, requires EPA to set National Ambient Air Quality Standards (40 CFR part 50) for pollutants considered harmful to public health and the environment.