When environment is no much longer safe considering contamination.
the problem which atmosphere is polluted by international substances, and/or substances on their own. Polluting of the environment is comprised of gaseous, fluid, or solid substances that, when contained in enough focus, for an adequate time, and under specific conditions, will affect person convenience, health or welfare, and cause environmental harm. Air pollution causes acidic rainfall, ozone exhaustion, photochemical smog, alongside such phenomena.
pollution associated with environment