Remote sensing of atmospheric nitrogen dioxide in an urban area in central northern Mexico
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abstract
Nitrogen dioxide (NO2) was measured in the urban area of San Luis Potosí (Mexico) using a remote sensing technique based on differential optical absorption spectroscopy (DOAS) in zenith-sky configuration. Measurements were taken from July to August 2015. In this technique, scattered sunlight in the atmosphere is collected by a telescope and carried onto a linear array-based spectrometer at ground level. During the measurement period, the maximum NO2 levels (2.3 × 1016 molecules cm–2) were found at around 11:00 LT, whereas NO2 levels fell on days with wind speeds lower than 1.5 m s–1. NO2 levels were compared and explained with the behavior of meteorological data such as wind speed, relative humidity, and surface temperature obtained from the Weather Research and Forecasting (WRF) model.
