accumulation, acid rain, aerobic bacteria, affect, air, anaerobic bacteria, asbestos, atmosphere
bacteria, ban, burning
carbon monoxide, cause, caution, chemicals, chronic, combustion, complicate, concentration, condition, contamination, corrosion, cycle
damage, dangerous, dead, debris, decay, decibel, decomposition, destruction, dirt, discharge, disease, disposal, drainage, dumping
effect, effluent, emission, engine, environment, erosion
factory, fallout, farming, fertilizer, fire, fireplace, fuel, fungi
gas, greenhouse effect
harmful, haze, heavy metal, hydrocarbon
imbalance, improvement, invasion
junk
kill
leach, lessen, levels, litter
manufacturing, matter, mercury, microbe, mold
nitrates, nitrogen dioxide, noise
odor, outdoors
particles, particulate, perpetual, persuasion, pesticide, phosphate, poison, pollutant, prevention, procedure, prosecute
quality, qualm, query, quest, questions
radiation, reckless, reduction, regulation, represent, resource, restriction, rule, run off
scattering, sewage, sewerage, silt, slag, smell, smog, smoke, soil, solid waste, stench, substance, sulfur dioxide, surroundings, survival
temperature, treatment plant, troublesome
ugly, unhealthy, unnatural, unsanitary, unsavory, untreated, upset, urban
vile, visibility
wash, waste, wasteful, water, worthless
X-ray
yearning, youth
zealot
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