Providing lights and air for the schools in your district.
Explanation:
The major cause of the pollutant entering the atmosphere is through the use of fossil fuels for various activities. These fuels when burnt releases Carbon dioxide, Carbon monoxide, nitrogen dioxide etc gases.
Among all the given options, providing lights and air for the school in your district would consume the least power. Consuming least power would translate into the need for producing less energy hence less fossil fuel consumption. As the fossil fuels consumption would be less, less amount of harmful gases would be emitted in atmosphere thus causing less air pollution.
