Despite such opposition, the first meters were installed by the Dual Parking Meter Company beginning in July 1935; they cost a nickel an hour, and were placed at 20-foot intervals along the curb that corresponded to spaces painted on the pavement.
The single solution for everything in your air. Many air cleaning systems filter out particles. Some combat germs, and some fight odors. But only the PureAirâ¢ Air Purification System addresses all three types of indoor air pollutants.
1 An ionic air purifier is able to remove very fine particles in the air, even from several feet away, but it does not work on odors or kill germs. 2  Ultraviolet light air purifiers. 3  The Ultraviolet light air purifier sterilizes micro-organisms as they pass through, including viruses, germs, bacteria and mold. A carbon air filter contains small pores that are very absorbent and chemically react to particles as they pass through and the odors and particles attach to the carbon. 2  This particular air purifier does not work against allergens or micro-organisms. 3  Ionic air purifiers.