Industrial air pollutants, such as organochlorines and heavy metals, are carried to the arctic on air currents from populated areas. Lichens are a dominant life form on the tundra, and they are particularly vulnerable to air pollution because they lack roots and get the majority of their resources from the air. Because of this, lichens have historically been used as air pollution indicators.
Hurst is a city in Tarrant County, Texas, United States. Hurst is one of the Mid-Cities between Fort Worth and Dallas. it is local a suburb of Fort Worth. The city was founded by William Letchworth Hurst. As of the 2010 census, it had a population of 37,337.
Homefacts City Report. Mcallen is located in Hidalgo County, TX. The population is 134,729, making Mcallen the largest city in Hidalgo County. There are 46 public schools in Mcallen with an average Homefacts rating of B-. The total crime rate for Mcallen is very low, and there are 202 registered sex offenders residing in the city.