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2. List of companies in Houston - Wikipedia

   en.wikipedia.org/wiki/List_of_companies_in_Houston

   Fortune 500 companies based in Houston [1]: Rank Company name 12: ExxonMobil: 48: Phillips 66: 60: Sysco: 105: Enterprise Products Partners: 106: Hewlett Packard Enterprise: 127: Plains GP Holdings

3. Air purifier - Wikipedia

   en.wikipedia.org/wiki/Air_purifier

   An air purifier or air cleaner is a device which removes contaminants from the air in a room to improve indoor air quality. These devices are commonly marketed as being beneficial to allergy sufferers and asthmatics , and at reducing or eliminating second-hand tobacco smoke .

4. Purifier - Wikipedia

   en.wikipedia.org/wiki/Purifier

   Purifier(s) may refer to: Air purifier , a device that filters pollution out of the air Water purification , removing contaminants from water, sometimes using a water purifier

5. Air ioniser - Wikipedia

   en.wikipedia.org/wiki/Air_ioniser

   Air ionisers are used in air purifiers to remove particles from air. [3] Airborne particles become charged as they attract charged ions from the ioniser by electrostatic attraction . The particles in turn are then attracted to any nearby earthed (grounded) conductors, either deliberate plates within an air cleaner, or simply the nearest walls ...

6. HEPA - Wikipedia

   en.wikipedia.org/wiki/HEPA

   HEPA filters are designed to arrest very fine particles effectively, but they do not filter out gasses and odor molecules. Circumstances requiring filtration of volatile organic compounds, chemical vapors, or cigarette, pet or flatulence odors call for the use of an activated carbon (charcoal) or other type of filter instead of or in addition to a HEPA filter. [20]

7. Southwest Houston - Wikipedia

   en.wikipedia.org/wiki/Southwest_Houston

   From the 1980 U.S. Census to the 1990 Census, many African-Americans left traditional African-American neighborhoods and entered parts of Southwest Houston; areas of Southwest Houston received from more than 1,000 African-Americans per square mile to more than 3,500 African-Americans per square mile.