NO2LA

NO2LA, also known as nitrogen dioxide, is a chemical compound with the formula NO2. It is a reddish-brown gas that is a prominent air pollutant. NO2 is formed through the oxidation of nitric oxide (NO) in the atmosphere, primarily through photochemical reactions involving sunlight. It is a significant contributor to smog and acid rain, and is also a respiratory irritant.

NO2 is a key intermediate in the atmospheric formation of ozone (O3), which is a major component of smog. It is also a precursor to nitric acid (HNO3), which contributes to acid rain. NO2 is primarily emitted from the combustion of fossil fuels in vehicles, power plants, and industrial processes.

The World Health Organization (WHO) has established guidelines for NO2 levels in the air, with a 24-hour mean concentration of 200 micrograms per cubic meter (µg/m3) and an annual mean concentration of 40 µg/m3. Exposure to high levels of NO2 can cause respiratory problems, including asthma and bronchitis, and can exacerbate existing heart and lung conditions.

NO2 can be measured using various methods, including chemiluminescence, ultraviolet-visible spectroscopy, and gas chromatography. Monitoring of NO2 levels is important for assessing air quality and implementing measures to reduce emissions and protect public health.