The Ambient Air Monitoring Program measures ground-level concentrations of criteria pollutants and air toxics, along with surface and aloft meteorological parameters. The Program also performs quality control, quality assurance, and analysis of the pollutant concentrations that are measured at each of the air monitoring stations located throughout Maryland. It is responsible for Air Quality Index (AQI) reporting and issuing daily air quality forecasts as well as coordination of 3D air-shed photochemical grid and dispersion modeling.
In addition, the Program collaborates with local universities to conduct special atmospheric monitoring research to better characterize aloft and surface atmospheric pollutant concentrations. These research initiatives support air quality planning and regulations development.
The Forecast widget has been removed temporarily to troubleshoot issues. Will be restored ASAP. For the most recent air quality forecast information, please visit airnow.gov
High pressure over the North Atlantic will set up a steady easterly flow Tuesday. Ozone production will be limited given a clean onshore flow. Good air quality is expected across the state. General cloudiness and intermittent precipitation is expected Wednesday and Thursday as a slow moving low pressure system and associated cold front push through the area. Ozone levels are expected to remain in the Good AQI range statewide. –MDE
Pollen can exacerbate the effects of pollution and vice versa. Get the latest pollen counts and forecast here: Pollen.com
To report an environmental emergency, see Emergency Numbers.
Last fall, the U.S. Environmental Protection Agency strengthened the health-based air quality standard for ozone, lowering the standard from 75 parts per billion (ppb) to 70 ppb. The updated standard will improve public health protection, particularly for at-risk groups such as children, older adults, people with heart or lung diseases and outdoor workers. Because of the new, more stringent yardstick being applied to ozone levels, the number of poor air days that are forecast and observed is expected to increase by about 30 percent. This doesn’t mean air quality has suddenly gotten worse. It means a more protective standard is now in place.
Have you heard the term “inversion” but not really understood what it means? An inversion is simply when temperature increases with increasing height. Normally temperature decreases with increasing height. This decrease in temperature is what allows snow on mountain tops while it may be sweltering at the mountain base. Inversions themselves are invisible – we can’t see the air. However, we can see what affect inversions have on the atmosphere. That’s becauseinversions act as a lid and trap whatever is emitted between them and the ground. This is particularly evident with pollution and most apparent during the winter months when inversions are typically the strongest. In the animated image to the left, a strong morning inversion developed over Maryland on Wednesday, January 6, 2016. Downtown Baltimore can be seen in the center left of the image. The image spans from 9am to 5pm local time. Without sunlight, inversions strengthen. As the sun had only risen briefly by 9am, the inversion on January 6th was near its lowest height (strongest intensity) of the day as often occurs near sunrise. Trapped pollution is evident as a “brownish” color due to elevated concentrations of nitrogen dioxide very near to the ground which is emitted from cars and other combustion sources. At the beginning of the animation, the brown area is very near the ground (lower black line) while up above a very blue, clean sky is visible, evidence of clean air. Over the course of the next few hours, the inversion “lifts”, that is, the pollution of the city (the brownish area) rises to a higher height (upper black line noted on the image). This increase in height of the inversion decreases pollution concentrations near the surface and is why in winter time, the most polluted part of the day is often in the early morning hours. *The white plume seen in the center of the image is steam. It illustrates changing wind direction during the day due to heating differences between the water and land.
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