| Type of greenhouse work | (met) | Permissible WBGT (°C) |
| No work is recommended | — | >32.5 | Preparation of spinach, defoliation of strawberry, leaves swing, standing relaxed, and so forth | 0.7–1 | <32.5 | Disbudding, training, pinching, planting, chemical spraying, and so forth | 1-2 | <30.5 | Weeding, fruit thinning, fertilizing, standing poles, extending screens, and so forth | 2-3 | <29.0 | Mowing, preparation of nursery beds, and so forth | 3-4 | <27.5 | Soil mounding, row creation, removal of crop wastes, and so forth | 4-5 | <26.5 | Digging with a spade, working with an axe, and so forth | 5–7 | <25 |
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