These seven (7) things are all that come to mind and I'm not sure if any, all or a combination of them could cause the lymph nodes under my jaw to become moderately sore and swollen. Again, they are not huge, hot to the touch, red, etc and there is no tracking.
Lichens and Air Pollution. One of the most common indicator species used to measure air pollution are lichens. Lichens are similar to fungi and algae, and absorb water and minerals from the air to grow on living and nonliving surfaces.As such, lichens absorb all the pollutants in the environment, and some varieties of lichen survive better in the presence of pollution than others.ichens and Air Pollution. One of the most common indicator species used to measure air pollution are lichens. Lichens are similar to fungi and algae, and absorb water and minerals from the air to grow on living and nonliving surfaces.
Most of the lichens do not have the mechanisms to absorb nutrients from soil and they depend on atmospheric sources for nutrition. Precipitation, fog ,dew and gaseous absorption plays an important role in atmospheric nutrition of lichens .Lichens growing on rock and soil surfaces are capable of entrapping soluble nutrients form the respective sources.