Population growth increases levels of air pollution, water pollution, soil contamination and noise pollution. The resulting fire caused extensive radioactive contamination. Extreme levels of air, water, and radiological contamination and pollution by industrial wastes resulted. Many landfills now require countermeasures against groundwater contamination. Microbial contamination and degradation of the membranes must be monitored. Any radioactive contamination in the primary water is confined. Leakage current due to internal contamination may also inject noise. Vapor intrusion can occur from sites with extensive subsurface solvent contamination. Both cautions are due to PCB and pesticide contamination. Effects occur to agricultural lands which have certain types of soil contamination. Outbreaks have occurred due to contamination of drinking alcohol. Fears of honey contamination with toxic oleander nectar are therefore unsubstantiated. Eggs are susceptible to "Salmonella" contamination. Nepal is subject to a serious problem with arsenic contamination. There has not been a full assessment of the risk posed by soil contamination.