Physics & Astronomy
crops
100%
power plants
79%
productivity
78%
ozone
72%
coal
71%
estimating
58%
carbon dioxide
45%
carbon
44%
vegetation
30%
fuel combustion
16%
fossil fuels
15%
nitrogen oxides
15%
biomass
14%
nitrogen
8%
oxides
6%
estimates
6%
Earth & Environmental Sciences
power plant
57%
ozone
51%
crop
47%
productivity
45%
coal
43%
carbon
37%
carbon dioxide
34%
plan
22%
policy
20%
loss
17%
ground-level ozone
15%
ozone precursor
15%
tropospheric ozone
13%
vegetation
13%
exposure
12%
nitrogen oxides
11%
environmental protection agency
10%
fossil fuel
10%
combustion
8%
oxide
8%
regulation
7%
public
7%
biomass
6%
nitrogen
6%
chemical
5%
analysis
2%
Agriculture & Biology
power plants
73%
coal
70%
ozone
69%
carbon
43%
crops
35%
carbon dioxide
34%
nitrogen oxides
30%
fuel combustion
16%
vegetation
16%
United States Environmental Protection Agency
14%
fossil fuels
12%
chronic exposure
12%
biomass
6%
Chemical Compounds
Ozone
67%
Coal
63%
Carbon Atom
31%
Reduction
15%
Nitrogen Oxide
13%
Fossil Fuel
13%
Nitrogen
6%
Oxide
5%