Special LED for pollution status monitoring

The invention provides a special LED for pollution status monitoring. The special LED comprises a cylindrical shell. A circuit board, an LED panel and a rear convex lens are sequentially arranged from back to front in the rear half section of the shell. The LED panel emits parallel light and is manufactured into a plane mirror. A front convex lens is arranged in the front rear half section of the cylindrical shell. The parallel light formed by the LED panel is refracted through the rear convex lens, collected in the portion, in front of the rear convex lens, of the cylindrical shell and then scattered till the light penetrates through the front convex lens, is refracted through the front convex lens and becomes parallel light. A plane reflection mirror is further arranged on the front side of the front convex lens, so that the parallel light penetrating through the front convex lens and injected forwards is returned backwards along the original path. Two light cones with the opposite vertices are formed between the rear convex lens and the front convex lens. An observation opening communicated with the external environment is formed in the circumferential wall, on the periphery of the light cones with the opposite vertices, of the cylindrical shell. The LED can provide a lighting section with the ultra-high brightness through low power, so that suspended impurities in air or water are conveniently monitored for a long time.