ID: 7720

AQSQID: 840250170010

Site Name: Chelmsfordnr

Added: April 21, 2020, 6:24 p.m.

Updated: July 10, 2020, 10:34 p.m.

Location: Chelmsford (E Chelmsford), MA

Reporting: True, Located: True

Current AQI: 21.0

Chelmsford (E Chelmsford) MA, US: 42.612113, -71.307519

Date Observed (UTC) NOX NO NOY NO2 NO2Y SO2 OZONE CO PM10 PM2.5 AQI AQI/500
July 10, 2020, 8 p.m. 16.0 ppb (15) 8.0 ppb (7) N/A 8.0 ppb (7) N/A N/A 18.0 ppb (14) N/A N/A 5.0 μg/m3 (21) 21.0
 
July 10, 2020, 7 p.m. 14.0 ppb (13) 7.0 ppb (6) N/A 7.0 ppb (6) N/A N/A 20.0 ppb (15) N/A N/A 6.0 μg/m3 (25) 25.0
 
July 10, 2020, 6 p.m. 15.0 ppb (14) 8.0 ppb (7) N/A 7.0 ppb (6) N/A N/A 21.0 ppb (16) N/A N/A 2.0 μg/m3 (8) 16.0
 
July 10, 2020, 5 p.m. 18.0 ppb (17) 8.0 ppb (7) N/A 10.0 ppb (9) N/A N/A 24.0 ppb (18) N/A N/A 5.0 μg/m3 (21) 21.0
 
July 10, 2020, 4 p.m. 21.0 ppb (19) 8.0 ppb (7) N/A 13.0 ppb (12) N/A N/A 29.0 ppb (22) N/A N/A 6.0 μg/m3 (25) 25.0
 
July 10, 2020, 3 p.m. 29.0 ppb (27) 14.0 ppb (13) N/A 15.0 ppb (14) N/A N/A 21.0 ppb (16) N/A N/A 9.0 μg/m3 (38) 38.0
 
July 10, 2020, 2 p.m. 22.0 ppb (20) 11.0 ppb (10) N/A 11.0 ppb (10) N/A N/A 19.0 ppb (15) N/A N/A 4.0 μg/m3 (17) 20.0
 
July 10, 2020, 1 p.m. 28.0 ppb (26) 18.0 ppb (17) N/A 10.0 ppb (9) N/A N/A 12.0 ppb (9) N/A N/A 5.0 μg/m3 (21) 26.0
 
July 10, 2020, noon 24.0 ppb (22) 16.0 ppb (15) N/A 8.0 ppb (7) N/A N/A 9.0 ppb (7) N/A N/A 7.0 μg/m3 (29) 29.0
 
July 10, 2020, 11 a.m. 27.0 ppb (25) 18.0 ppb (17) N/A 9.0 ppb (8) N/A N/A 6.0 ppb (5) N/A N/A 6.0 μg/m3 (25) 25.0
 
July 10, 2020, 10 a.m. 31.0 ppb (29) 22.0 ppb (20) N/A 9.0 ppb (8) N/A N/A 5.0 ppb (4) N/A N/A 4.0 μg/m3 (17) 29.0
 
July 10, 2020, 9 a.m. 34.0 ppb (31) 24.0 ppb (22) N/A 10.0 ppb (9) N/A N/A 3.0 ppb (2) N/A N/A 5.0 μg/m3 (21) 31.0
 
July 10, 2020, 8 a.m. 20.0 ppb (19) 11.0 ppb (10) N/A 9.0 ppb (8) N/A N/A 5.0 ppb (4) N/A N/A 6.0 μg/m3 (25) 25.0
 
July 10, 2020, 7 a.m. 21.0 ppb (19) 11.0 ppb (10) N/A 10.0 ppb (9) N/A N/A 7.0 ppb (5) N/A N/A 9.0 μg/m3 (38) 38.0
 
July 10, 2020, 6 a.m. 17.0 ppb (16) 6.0 ppb (6) N/A 11.0 ppb (10) N/A N/A 8.0 ppb (6) N/A N/A 11.0 μg/m3 (46) 46.0
 
July 10, 2020, 5 a.m. 25.0 ppb (23) 11.0 ppb (10) N/A 14.0 ppb (13) N/A N/A 10.0 ppb (8) N/A N/A 6.0 μg/m3 (25) 25.0
 
July 10, 2020, 4 a.m. 16.0 ppb (15) 5.0 ppb (5) N/A 11.0 ppb (10) N/A N/A 16.0 ppb (12) N/A N/A 7.0 μg/m3 (29) 29.0
 
July 10, 2020, 3 a.m. 23.0 ppb (21) 8.0 ppb (7) N/A 15.0 ppb (14) N/A N/A 15.0 ppb (12) N/A N/A 12.0 μg/m3 (50) 50.0
 
July 10, 2020, 2 a.m. 26.0 ppb (24) 11.0 ppb (10) N/A 16.0 ppb (15) N/A N/A 16.0 ppb (12) N/A N/A 10.0 μg/m3 (42) 42.0
 
July 10, 2020, 1 a.m. 20.0 ppb (19) 6.0 ppb (6) N/A 14.0 ppb (13) N/A N/A 21.0 ppb (16) N/A N/A 7.0 μg/m3 (29) 29.0
 
July 10, 2020, midnight 17.0 ppb (16) 4.0 ppb (4) N/A 13.0 ppb (12) N/A N/A 28.0 ppb (22) N/A N/A 10.0 μg/m3 (42) 42.0
 
July 9, 2020, 11 p.m. 18.0 ppb (17) 3.0 ppb (3) N/A 16.0 ppb (15) N/A N/A 42.0 ppb (32) N/A N/A 16.0 μg/m3 (59) 59.0
 
July 9, 2020, 10 p.m. 17.0 ppb (16) 3.0 ppb (3) N/A 14.0 ppb (13) N/A N/A 48.0 ppb (37) N/A N/A 15.0 μg/m3 (56) 56.0
 
July 9, 2020, 9 p.m. 19.0 ppb (18) 3.0 ppb (3) N/A 16.0 ppb (15) N/A N/A 50.0 ppb (38) N/A N/A 18.0 μg/m3 (63) 63.0
 
July 9, 2020, 8 p.m. 14.0 ppb (13) 1.0 ppb (1) N/A 12.0 ppb (11) N/A N/A 56.0 ppb (43) N/A N/A 17.0 μg/m3 (61) 61.0
 
July 9, 2020, 7 p.m. 24.0 ppb (22) 8.0 ppb (7) N/A 16.0 ppb (15) N/A N/A 41.0 ppb (32) N/A N/A 13.0 μg/m3 (52) 52.0
 
July 9, 2020, 6 p.m. 22.0 ppb (20) 7.0 ppb (6) N/A 15.0 ppb (14) N/A N/A 37.0 ppb (28) N/A N/A 16.0 μg/m3 (59) 59.0
 
July 9, 2020, 5 p.m. 21.0 ppb (19) 7.0 ppb (6) N/A 14.0 ppb (13) N/A N/A 37.0 ppb (28) N/A N/A 12.0 μg/m3 (50) 50.0
 
July 9, 2020, 4 p.m. 27.0 ppb (25) 9.0 ppb (8) N/A 18.0 ppb (17) N/A N/A 38.0 ppb (29) N/A N/A 15.0 μg/m3 (56) 56.0
 
July 9, 2020, 3 p.m. 15.0 ppb (14) 4.0 ppb (4) N/A 11.0 ppb (10) N/A N/A 43.0 ppb (33) N/A N/A 11.0 μg/m3 (46) 46.0
 
July 9, 2020, 2 p.m. 13.0 ppb (12) 4.0 ppb (4) N/A 9.0 ppb (8) N/A N/A 38.0 ppb (29) N/A N/A 10.0 μg/m3 (42) 42.0
 
July 9, 2020, 1 p.m. 11.0 ppb (10) 4.0 ppb (4) N/A 7.0 ppb (6) N/A N/A 32.0 ppb (25) N/A N/A 8.0 μg/m3 (33) 33.0
 
July 9, 2020, noon 10.0 ppb (9) 3.0 ppb (3) N/A 6.0 ppb (6) N/A N/A 25.0 ppb (19) N/A N/A 12.0 μg/m3 (50) 50.0
 
July 9, 2020, 11 a.m. 20.0 ppb (19) 9.0 ppb (8) N/A 11.0 ppb (10) N/A N/A 13.0 ppb (10) N/A N/A 9.0 μg/m3 (38) 38.0
 
July 9, 2020, 10 a.m. 37.0 ppb (34) 25.0 ppb (23) N/A 12.0 ppb (11) N/A N/A 3.0 ppb (2) N/A N/A 9.0 μg/m3 (38) 38.0
 
July 9, 2020, 9 a.m. 32.0 ppb (30) 21.0 ppb (19) N/A 11.0 ppb (10) N/A N/A 2.0 ppb (2) N/A N/A 7.0 μg/m3 (29) 30.0
 
July 9, 2020, 8 a.m. 20.0 ppb (19) 9.0 ppb (8) N/A 11.0 ppb (10) N/A N/A N/A N/A N/A 8.0 μg/m3 (33) 33.0
 
July 9, 2020, 7 a.m. N/A N/A N/A N/A N/A N/A 7.0 ppb (5) N/A N/A 9.0 μg/m3 (38) 38.0
 
July 9, 2020, 6 a.m. N/A N/A N/A N/A N/A N/A 4.0 ppb (3) N/A N/A 9.0 μg/m3 (38) 38.0
 
July 9, 2020, 5 a.m. N/A N/A N/A N/A N/A N/A 10.0 ppb (8) N/A N/A 6.0 μg/m3 (25) 25.0
 
July 9, 2020, 4 a.m. 26.0 ppb (24) 10.0 ppb (9) N/A 16.0 ppb (15) N/A N/A 13.0 ppb (10) N/A N/A 9.0 μg/m3 (38) 38.0
 
July 9, 2020, 3 a.m. 24.0 ppb (22) 8.0 ppb (7) N/A 16.0 ppb (15) N/A N/A 12.0 ppb (9) N/A N/A 11.0 μg/m3 (46) 46.0
 
July 9, 2020, 2 a.m. 21.0 ppb (19) 5.0 ppb (5) N/A 16.0 ppb (15) N/A N/A 17.0 ppb (13) N/A N/A 11.0 μg/m3 (46) 46.0
 
July 9, 2020, 1 a.m. 17.0 ppb (16) 2.0 ppb (2) N/A 14.0 ppb (13) N/A N/A 22.0 ppb (17) N/A N/A 10.0 μg/m3 (42) 42.0
 
July 9, 2020, midnight 14.0 ppb (13) 2.0 ppb (2) N/A 12.0 ppb (11) N/A N/A 27.0 ppb (21) N/A N/A 11.0 μg/m3 (46) 46.0
 
July 8, 2020, 11 p.m. 12.0 ppb (11) 2.0 ppb (2) N/A 10.0 ppb (9) N/A N/A 29.0 ppb (22) N/A N/A 11.0 μg/m3 (46) 46.0
 
July 8, 2020, 10 p.m. 15.0 ppb (14) 3.0 ppb (3) N/A 12.0 ppb (11) N/A N/A 34.0 ppb (26) N/A N/A 11.0 μg/m3 (46) 46.0
 
July 8, 2020, 9 p.m. 23.0 ppb (21) 8.0 ppb (7) N/A 15.0 ppb (14) N/A N/A 28.0 ppb (22) N/A N/A 13.0 μg/m3 (52) 52.0
 
July 8, 2020, 8 p.m. 21.0 ppb (19) 7.0 ppb (6) N/A 13.0 ppb (12) N/A N/A 34.0 ppb (26) N/A N/A 17.0 μg/m3 (61) 61.0
 
July 8, 2020, 7 p.m. 26.0 ppb (24) 10.0 ppb (9) N/A 16.0 ppb (15) N/A N/A 33.0 ppb (25) N/A N/A 13.0 μg/m3 (52) 52.0
 
July 8, 2020, 6 p.m. 25.0 ppb (23) 10.0 ppb (9) N/A 15.0 ppb (14) N/A N/A 33.0 ppb (25) N/A N/A 11.0 μg/m3 (46) 46.0
 
July 8, 2020, 5 p.m. 22.0 ppb (20) 9.0 ppb (8) N/A 13.0 ppb (12) N/A N/A 29.0 ppb (22) N/A N/A 10.0 μg/m3 (42) 42.0
 
July 8, 2020, 4 p.m. 24.0 ppb (22) 10.0 ppb (9) N/A 13.0 ppb (12) N/A N/A 25.0 ppb (19) N/A N/A 10.0 μg/m3 (42) 42.0
 
July 8, 2020, 3 p.m. 29.0 ppb (27) 12.0 ppb (11) N/A 17.0 ppb (16) N/A N/A 23.0 ppb (18) N/A N/A N/A 27.0
 
July 8, 2020, 2 p.m. 29.0 ppb (27) 16.0 ppb (15) N/A 13.0 ppb (12) N/A N/A 20.0 ppb (15) N/A N/A 10.0 μg/m3 (42) 42.0
 
July 8, 2020, 1 p.m. 28.0 ppb (26) 18.0 ppb (17) N/A 11.0 ppb (10) N/A N/A 12.0 ppb (9) N/A N/A 7.0 μg/m3 (29) 29.0
 
July 8, 2020, noon 36.0 ppb (33) 24.0 ppb (22) N/A 12.0 ppb (11) N/A N/A 8.0 ppb (6) N/A N/A 10.0 μg/m3 (42) 42.0
 
July 8, 2020, 11 a.m. 28.0 ppb (26) 17.0 ppb (16) N/A 11.0 ppb (10) N/A N/A 8.0 ppb (6) N/A N/A 11.0 μg/m3 (46) 46.0
 
July 8, 2020, 10 a.m. 39.0 ppb (36) 25.0 ppb (23) N/A 13.0 ppb (12) N/A N/A 6.0 ppb (5) N/A N/A 6.0 μg/m3 (25) 36.0
 
July 8, 2020, 9 a.m. 27.0 ppb (25) 16.0 ppb (15) N/A 11.0 ppb (10) N/A N/A 8.0 ppb (6) N/A N/A 7.0 μg/m3 (29) 29.0
 
July 8, 2020, 8 a.m. 16.0 ppb (15) 7.0 ppb (6) N/A 9.0 ppb (8) N/A N/A 12.0 ppb (9) N/A N/A 9.0 μg/m3 (38) 38.0
 
July 8, 2020, 7 a.m. 11.0 ppb (10) 5.0 ppb (5) N/A 6.0 ppb (6) N/A N/A 15.0 ppb (12) N/A N/A 7.0 μg/m3 (29) 29.0
 
July 8, 2020, 6 a.m. 16.0 ppb (15) 9.0 ppb (8) N/A 8.0 ppb (7) N/A N/A 16.0 ppb (12) N/A N/A 6.0 μg/m3 (25) 25.0
 
July 8, 2020, 5 a.m. 12.0 ppb (11) 5.0 ppb (5) N/A 7.0 ppb (6) N/A N/A 19.0 ppb (15) N/A N/A 4.0 μg/m3 (17) 17.0
 
July 8, 2020, 4 a.m. 11.0 ppb (10) 4.0 ppb (4) N/A 7.0 ppb (6) N/A N/A 22.0 ppb (17) N/A N/A 4.0 μg/m3 (17) 17.0
 
July 8, 2020, 3 a.m. 16.0 ppb (15) 7.0 ppb (6) N/A 9.0 ppb (8) N/A N/A 21.0 ppb (16) N/A N/A 6.0 μg/m3 (25) 25.0
 
July 8, 2020, 2 a.m. 16.0 ppb (15) 7.0 ppb (6) N/A 9.0 ppb (8) N/A N/A 21.0 ppb (16) N/A N/A 6.0 μg/m3 (25) 25.0
 
July 8, 2020, 1 a.m. 13.0 ppb (12) 4.0 ppb (4) N/A 8.0 ppb (7) N/A N/A 25.0 ppb (19) N/A N/A 7.0 μg/m3 (29) 29.0
 
July 8, 2020, midnight 13.0 ppb (12) 4.0 ppb (4) N/A 8.0 ppb (7) N/A N/A 27.0 ppb (21) N/A N/A 6.0 μg/m3 (25) 25.0
 
July 7, 2020, 11 p.m. 17.0 ppb (16) 7.0 ppb (6) N/A 11.0 ppb (10) N/A N/A 28.0 ppb (22) N/A N/A 5.0 μg/m3 (21) 22.0
 
July 7, 2020, 10 p.m. 17.0 ppb (16) 6.0 ppb (6) N/A 10.0 ppb (9) N/A N/A 34.0 ppb (26) N/A N/A 4.0 μg/m3 (17) 26.0
 
July 7, 2020, 9 p.m. 19.0 ppb (18) 7.0 ppb (6) N/A 12.0 ppb (11) N/A N/A 34.0 ppb (26) N/A N/A 4.0 μg/m3 (17) 26.0
 
July 7, 2020, 8 p.m. 19.0 ppb (18) 8.0 ppb (7) N/A 11.0 ppb (10) N/A N/A 34.0 ppb (26) N/A N/A 4.0 μg/m3 (17) 26.0
 
July 7, 2020, 7 p.m. 25.0 ppb (23) 12.0 ppb (11) N/A 13.0 ppb (12) N/A N/A 30.0 ppb (23) N/A N/A 6.0 μg/m3 (25) 25.0
 
July 7, 2020, 6 p.m. 19.0 ppb (18) 8.0 ppb (7) N/A 11.0 ppb (10) N/A N/A 32.0 ppb (25) N/A N/A 8.0 μg/m3 (33) 33.0
 
July 7, 2020, 5 p.m. 25.0 ppb (23) 12.0 ppb (11) N/A 14.0 ppb (13) N/A N/A 30.0 ppb (23) N/A N/A 6.0 μg/m3 (25) 25.0
 
July 7, 2020, 4 p.m. 26.0 ppb (24) 12.0 ppb (11) N/A 14.0 ppb (13) N/A N/A 28.0 ppb (22) N/A N/A 7.0 μg/m3 (29) 29.0
 
July 7, 2020, 3 p.m. 28.0 ppb (26) 14.0 ppb (13) N/A 14.0 ppb (13) N/A N/A 25.0 ppb (19) N/A N/A 10.0 μg/m3 (42) 42.0
 
July 7, 2020, 2 p.m. 32.0 ppb (30) 17.0 ppb (16) N/A 14.0 ppb (13) N/A N/A 19.0 ppb (15) N/A N/A 6.0 μg/m3 (25) 30.0
 
July 7, 2020, 1 p.m. 39.0 ppb (36) 24.0 ppb (22) N/A 15.0 ppb (14) N/A N/A 12.0 ppb (9) N/A N/A 6.0 μg/m3 (25) 36.0
 
July 7, 2020, noon 37.0 ppb (34) 24.0 ppb (22) N/A 13.0 ppb (12) N/A N/A 8.0 ppb (6) N/A N/A 6.0 μg/m3 (25) 34.0
 
July 7, 2020, 11 a.m. 39.0 ppb (36) 29.0 ppb (27) N/A 10.0 ppb (9) N/A N/A 4.0 ppb (3) N/A N/A 8.0 μg/m3 (33) 36.0
 
July 7, 2020, 10 a.m. 43.0 ppb (40) 33.0 ppb (31) N/A 10.0 ppb (9) N/A N/A 3.0 ppb (2) N/A N/A 6.0 μg/m3 (25) 40.0
 
July 7, 2020, 9 a.m. 38.0 ppb (35) 29.0 ppb (27) N/A 9.0 ppb (8) N/A N/A 2.0 ppb (2) N/A N/A 9.0 μg/m3 (38) 38.0
 
July 7, 2020, 8 a.m. 28.0 ppb (26) 19.0 ppb (18) N/A 9.0 ppb (8) N/A N/A 3.0 ppb (2) N/A N/A 8.0 μg/m3 (33) 33.0
 
July 7, 2020, 7 a.m. 26.0 ppb (24) 16.0 ppb (15) N/A 9.0 ppb (8) N/A N/A 3.0 ppb (2) N/A N/A 4.0 μg/m3 (17) 24.0
 
July 7, 2020, 6 a.m. 17.0 ppb (16) 8.0 ppb (7) N/A 9.0 ppb (8) N/A N/A 3.0 ppb (2) N/A N/A 6.0 μg/m3 (25) 25.0
 
July 7, 2020, 5 a.m. 18.0 ppb (17) 8.0 ppb (7) N/A 10.0 ppb (9) N/A N/A 6.0 ppb (5) N/A N/A 4.0 μg/m3 (17) 17.0
 
July 7, 2020, 4 a.m. 17.0 ppb (16) 6.0 ppb (6) N/A 10.0 ppb (9) N/A N/A 9.0 ppb (7) N/A N/A 5.0 μg/m3 (21) 21.0
 
July 7, 2020, 3 a.m. 14.0 ppb (13) 4.0 ppb (4) N/A 10.0 ppb (9) N/A N/A 11.0 ppb (8) N/A N/A 6.0 μg/m3 (25) 25.0
 
July 7, 2020, 2 a.m. 24.0 ppb (22) 12.0 ppb (11) N/A 13.0 ppb (12) N/A N/A 11.0 ppb (8) N/A N/A 6.0 μg/m3 (25) 25.0
 
July 7, 2020, 1 a.m. 21.0 ppb (19) 9.0 ppb (8) N/A 12.0 ppb (11) N/A N/A 15.0 ppb (12) N/A N/A 7.0 μg/m3 (29) 29.0
 
July 7, 2020, midnight 23.0 ppb (21) 9.0 ppb (8) N/A 14.0 ppb (13) N/A N/A 18.0 ppb (14) N/A N/A 6.0 μg/m3 (25) 25.0
 
July 6, 2020, 11 p.m. 18.0 ppb (17) 7.0 ppb (6) N/A 10.0 ppb (9) N/A N/A 23.0 ppb (18) N/A N/A 5.0 μg/m3 (21) 21.0
 
July 6, 2020, 10 p.m. 12.0 ppb (11) 4.0 ppb (4) N/A 8.0 ppb (7) N/A N/A 30.0 ppb (23) N/A N/A 6.0 μg/m3 (25) 25.0
 
July 6, 2020, 9 p.m. 14.0 ppb (13) 6.0 ppb (6) N/A 8.0 ppb (7) N/A N/A 27.0 ppb (21) N/A N/A 5.0 μg/m3 (21) 21.0
 
July 6, 2020, 8 p.m. 13.0 ppb (12) 5.0 ppb (5) N/A 8.0 ppb (7) N/A N/A 28.0 ppb (22) N/A N/A 7.0 μg/m3 (29) 29.0
 
July 6, 2020, 7 p.m. 12.0 ppb (11) 5.0 ppb (5) N/A 7.0 ppb (6) N/A N/A 28.0 ppb (22) N/A N/A 6.0 μg/m3 (25) 25.0
 
July 6, 2020, 6 p.m. 14.0 ppb (13) 6.0 ppb (6) N/A 8.0 ppb (7) N/A N/A 29.0 ppb (22) N/A N/A 8.0 μg/m3 (33) 33.0
 
July 6, 2020, 5 p.m. 17.0 ppb (16) 7.0 ppb (6) N/A 10.0 ppb (9) N/A N/A 27.0 ppb (21) N/A N/A 5.0 μg/m3 (21) 21.0
 
July 6, 2020, 4 p.m. 22.0 ppb (20) 10.0 ppb (9) N/A 12.0 ppb (11) N/A N/A 26.0 ppb (20) N/A N/A 7.0 μg/m3 (29) 29.0
 
July 6, 2020, 3 p.m. 9.0 ppb (8) 3.0 ppb (3) N/A 5.0 ppb (5) N/A N/A 29.0 ppb (22) N/A N/A 6.0 μg/m3 (25) 25.0
 
July 6, 2020, 2 p.m. 10.0 ppb (9) 4.0 ppb (4) N/A 6.0 ppb (6) N/A N/A 26.0 ppb (20) N/A N/A 4.0 μg/m3 (17) 20.0
 
July 6, 2020, 1 p.m. 11.0 ppb (10) 5.0 ppb (5) N/A 6.0 ppb (6) N/A N/A 22.0 ppb (17) N/A N/A 6.0 μg/m3 (25) 25.0
 
July 6, 2020, noon 5.0 ppb (5) 2.0 ppb (2) N/A 3.0 ppb (3) N/A N/A 17.0 ppb (13) N/A N/A 6.0 μg/m3 (25) 25.0
 
July 6, 2020, 11 a.m. 6.0 ppb (6) 2.0 ppb (2) N/A 3.0 ppb (3) N/A N/A 16.0 ppb (12) N/A N/A 3.0 μg/m3 (12) 12.0
 
July 6, 2020, 10 a.m. 8.0 ppb (7) 3.0 ppb (3) N/A 5.0 ppb (5) N/A N/A 13.0 ppb (10) N/A N/A 2.0 μg/m3 (8) 10.0
 
July 6, 2020, 9 a.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 15.0 ppb (12) N/A N/A 5.0 μg/m3 (21) 21.0
 
July 6, 2020, 8 a.m. 3.0 ppb (3) 0.0 ppb (0) N/A 2.0 ppb (2) N/A N/A N/A N/A N/A 5.0 μg/m3 (21) 21.0
 
July 6, 2020, 7 a.m. N/A N/A N/A N/A N/A N/A 12.0 ppb (9) N/A N/A 5.0 μg/m3 (21) 21.0
 
July 6, 2020, 6 a.m. N/A N/A N/A N/A N/A N/A 7.0 ppb (5) N/A N/A 7.0 μg/m3 (29) 29.0
 
July 6, 2020, 5 a.m. N/A N/A N/A N/A N/A N/A 12.0 ppb (9) N/A N/A 9.0 μg/m3 (38) 38.0
 
July 6, 2020, 4 a.m. 9.0 ppb (8) 3.0 ppb (3) N/A 7.0 ppb (6) N/A N/A 14.0 ppb (11) N/A N/A 8.0 μg/m3 (33) 33.0
 
July 6, 2020, 3 a.m. 8.0 ppb (7) 1.0 ppb (1) N/A 7.0 ppb (6) N/A N/A 17.0 ppb (13) N/A N/A 8.0 μg/m3 (33) 33.0
 
July 6, 2020, 2 a.m. 12.0 ppb (11) 3.0 ppb (3) N/A 8.0 ppb (7) N/A N/A 18.0 ppb (14) N/A N/A 11.0 μg/m3 (46) 46.0
 
July 6, 2020, 1 a.m. 10.0 ppb (9) 1.0 ppb (1) N/A 9.0 ppb (8) N/A N/A 22.0 ppb (17) N/A N/A 17.0 μg/m3 (61) 61.0
 
July 6, 2020, midnight 9.0 ppb (8) 1.0 ppb (1) N/A 9.0 ppb (8) N/A N/A 28.0 ppb (22) N/A N/A 9.0 μg/m3 (38) 38.0
 
July 5, 2020, 11 p.m. 13.0 ppb (12) 3.0 ppb (3) N/A 11.0 ppb (10) N/A N/A 33.0 ppb (25) N/A N/A 12.0 μg/m3 (50) 50.0
 
July 5, 2020, 10 p.m. 8.0 ppb (7) 2.0 ppb (2) N/A 7.0 ppb (6) N/A N/A 39.0 ppb (30) N/A N/A 10.0 μg/m3 (42) 42.0
 
July 5, 2020, 9 p.m. 8.0 ppb (7) 2.0 ppb (2) N/A 7.0 ppb (6) N/A N/A 47.0 ppb (36) N/A N/A 16.0 μg/m3 (59) 59.0
 
July 5, 2020, 8 p.m. 9.0 ppb (8) 2.0 ppb (2) N/A 7.0 ppb (6) N/A N/A 45.0 ppb (35) N/A N/A 14.0 μg/m3 (54) 54.0
 
July 5, 2020, 7 p.m. 11.0 ppb (10) 3.0 ppb (3) N/A 8.0 ppb (7) N/A N/A 40.0 ppb (31) N/A N/A 12.0 μg/m3 (50) 50.0
 
July 5, 2020, 6 p.m. 9.0 ppb (8) 3.0 ppb (3) N/A 6.0 ppb (6) N/A N/A 45.0 ppb (35) N/A N/A 16.0 μg/m3 (59) 59.0
 
July 5, 2020, 5 p.m. 9.0 ppb (8) 2.0 ppb (2) N/A 7.0 ppb (6) N/A N/A 44.0 ppb (34) N/A N/A 18.0 μg/m3 (63) 63.0
 
July 5, 2020, 4 p.m. 5.0 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A N/A 40.0 ppb (31) N/A N/A 20.0 μg/m3 (67) 67.0
 
July 5, 2020, 3 p.m. 5.0 ppb (5) 2.0 ppb (2) N/A 4.0 ppb (4) N/A N/A 33.0 ppb (25) N/A N/A 18.0 μg/m3 (63) 63.0
 
July 5, 2020, 2 p.m. 5.0 ppb (5) 2.0 ppb (2) N/A 3.0 ppb (3) N/A N/A 24.0 ppb (18) N/A N/A 18.0 μg/m3 (63) 63.0
 
July 5, 2020, 1 p.m. 7.0 ppb (6) 4.0 ppb (4) N/A 3.0 ppb (3) N/A N/A 13.0 ppb (10) N/A N/A 25.0 μg/m3 (78) 78.0
 
July 5, 2020, noon 6.0 ppb (6) 2.0 ppb (2) N/A 4.0 ppb (4) N/A N/A 10.0 ppb (8) N/A N/A 28.0 μg/m3 (84) 84.0
 
July 5, 2020, 11 a.m. 6.0 ppb (6) 1.0 ppb (1) N/A 5.0 ppb (5) N/A N/A 8.0 ppb (6) N/A N/A 22.0 μg/m3 (71) 71.0
 
July 5, 2020, 10 a.m. 14.0 ppb (13) 6.0 ppb (6) N/A 7.0 ppb (6) N/A N/A 4.0 ppb (3) N/A N/A 32.0 μg/m3 (93) 93.0
 
July 5, 2020, 9 a.m. 14.0 ppb (13) 6.0 ppb (6) N/A 8.0 ppb (7) N/A N/A 2.0 ppb (2) N/A N/A 34.0 μg/m3 (97) 97.0
 
July 5, 2020, 8 a.m. 9.0 ppb (8) 2.0 ppb (2) N/A 7.0 ppb (6) N/A N/A 2.0 ppb (2) N/A N/A 29.0 μg/m3 (86) 86.0
 
July 5, 2020, 7 a.m. 8.0 ppb (7) 1.0 ppb (1) N/A 7.0 ppb (6) N/A N/A 3.0 ppb (2) N/A N/A 37.0 μg/m3 (104) 104.0
 
July 5, 2020, 6 a.m. 11.0 ppb (10) 3.0 ppb (3) N/A 7.0 ppb (6) N/A N/A 5.0 ppb (4) N/A N/A 36.0 μg/m3 (101) 101.0
 
July 5, 2020, 5 a.m. 7.0 ppb (6) 0.0 ppb (0) N/A 6.0 ppb (6) N/A N/A 8.0 ppb (6) N/A N/A 40.0 μg/m3 (111) 111.0
 
July 5, 2020, 4 a.m. 9.0 ppb (8) 1.0 ppb (1) N/A 8.0 ppb (7) N/A N/A 10.0 ppb (8) N/A N/A 38.0 μg/m3 (106) 106.0
 
July 5, 2020, 3 a.m. 9.0 ppb (8) 1.0 ppb (1) N/A 7.0 ppb (6) N/A N/A 14.0 ppb (11) N/A N/A 32.0 μg/m3 (93) 93.0
 
July 5, 2020, 2 a.m. 12.0 ppb (11) 3.0 ppb (3) N/A 9.0 ppb (8) N/A N/A 17.0 ppb (13) N/A N/A 41.0 μg/m3 (114) 114.0
 
July 5, 2020, 1 a.m. 10.0 ppb (9) 2.0 ppb (2) N/A 7.0 ppb (6) N/A N/A 21.0 ppb (16) N/A N/A 18.0 μg/m3 (63) 63.0
 
July 5, 2020, midnight 11.0 ppb (10) 3.0 ppb (3) N/A 8.0 ppb (7) N/A N/A 25.0 ppb (19) N/A N/A 8.0 μg/m3 (33) 33.0
 
July 4, 2020, 11 p.m. 9.0 ppb (8) 2.0 ppb (2) N/A 6.0 ppb (6) N/A N/A 31.0 ppb (24) N/A N/A 10.0 μg/m3 (42) 42.0
 
July 4, 2020, 10 p.m. 5.0 ppb (5) 1.0 ppb (1) N/A 4.0 ppb (4) N/A N/A 38.0 ppb (29) N/A N/A 7.0 μg/m3 (29) 29.0
 
July 4, 2020, 9 p.m. 6.0 ppb (6) 2.0 ppb (2) N/A 4.0 ppb (4) N/A N/A 39.0 ppb (30) N/A N/A 5.0 μg/m3 (21) 30.0
 
July 4, 2020, 8 p.m. 6.0 ppb (6) 2.0 ppb (2) N/A 4.0 ppb (4) N/A N/A 42.0 ppb (32) N/A N/A 5.0 μg/m3 (21) 32.0
 
July 4, 2020, 7 p.m. 7.0 ppb (6) 2.0 ppb (2) N/A 4.0 ppb (4) N/A N/A 37.0 ppb (28) N/A N/A 6.0 μg/m3 (25) 28.0
 
July 4, 2020, 6 p.m. 6.0 ppb (6) 2.0 ppb (2) N/A 3.0 ppb (3) N/A N/A 32.0 ppb (25) N/A N/A 5.0 μg/m3 (21) 25.0
 
July 4, 2020, 5 p.m. 5.0 ppb (5) 2.0 ppb (2) N/A 3.0 ppb (3) N/A N/A 29.0 ppb (22) N/A N/A 2.0 μg/m3 (8) 22.0
 
July 4, 2020, 4 p.m. 6.0 ppb (6) 3.0 ppb (3) N/A 3.0 ppb (3) N/A N/A 28.0 ppb (22) N/A N/A 4.0 μg/m3 (17) 22.0
 
July 4, 2020, 3 p.m. 4.0 ppb (4) 2.0 ppb (2) N/A 2.0 ppb (2) N/A N/A 29.0 ppb (22) N/A N/A 3.0 μg/m3 (12) 22.0
 
July 4, 2020, 2 p.m. 5.0 ppb (5) 2.0 ppb (2) N/A 3.0 ppb (3) N/A N/A 29.0 ppb (22) N/A N/A 3.0 μg/m3 (12) 22.0
 
July 4, 2020, 1 p.m. 8.0 ppb (7) 4.0 ppb (4) N/A 4.0 ppb (4) N/A N/A 25.0 ppb (19) N/A N/A 2.0 μg/m3 (8) 19.0
 
July 4, 2020, noon 3.0 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 25.0 ppb (19) N/A N/A 2.0 μg/m3 (8) 19.0
 
July 4, 2020, 11 a.m. 2.0 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) N/A N/A 25.0 ppb (19) N/A N/A 3.0 μg/m3 (12) 19.0
 
July 4, 2020, 10 a.m. 2.0 ppb (2) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 25.0 ppb (19) N/A N/A 3.0 μg/m3 (12) 19.0
 
July 4, 2020, 9 a.m. 2.0 ppb (2) 1.0 ppb (1) N/A 1.0 ppb (1) N/A N/A 26.0 ppb (20) N/A N/A 5.0 μg/m3 (21) 21.0
 
July 4, 2020, 8 a.m. 1.0 ppb (1) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A 24.0 ppb (18) N/A N/A 6.0 μg/m3 (25) 25.0
 
July 4, 2020, 7 a.m. 1.0 ppb (1) 1.0 ppb (1) N/A 1.0 ppb (1) N/A N/A 25.0 ppb (19) N/A N/A 2.0 μg/m3 (8) 19.0
 
July 4, 2020, 6 a.m. 2.0 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A N/A 27.0 ppb (21) N/A N/A 4.0 μg/m3 (17) 21.0
 
July 4, 2020, 5 a.m. 3.0 ppb (3) 0.0 ppb (0) N/A 2.0 ppb (2) N/A N/A 28.0 ppb (22) N/A N/A 4.0 μg/m3 (17) 22.0
 
July 4, 2020, 4 a.m. 2.0 ppb (2) 0.0 ppb (0) N/A 2.0 ppb (2) N/A N/A 28.0 ppb (22) N/A N/A 4.0 μg/m3 (17) 22.0
 
July 4, 2020, 3 a.m. 2.0 ppb (2) 0.0 ppb (0) N/A 1.0 ppb (1) N/A N/A 28.0 ppb (22) N/A N/A 7.0 μg/m3 (29) 29.0
 
July 4, 2020, 2 a.m. 3.0 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 29.0 ppb (22) N/A N/A 9.0 μg/m3 (38) 38.0
 
July 4, 2020, 1 a.m. 3.0 ppb (3) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 26.0 ppb (20) N/A N/A 5.0 μg/m3 (21) 21.0
 
July 4, 2020, midnight 4.0 ppb (4) 1.0 ppb (1) N/A 4.0 ppb (4) N/A N/A 24.0 ppb (18) N/A N/A 6.0 μg/m3 (25) 25.0
 
July 3, 2020, 11 p.m. 3.0 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 24.0 ppb (18) N/A N/A 4.0 μg/m3 (17) 18.0
 
July 3, 2020, 10 p.m. 3.0 ppb (3) 1.0 ppb (1) N/A 2.0 ppb (2) N/A N/A 27.0 ppb (21) N/A N/A 3.0 μg/m3 (12) 21.0
 
July 3, 2020, 9 p.m. 4.0 ppb (4) 1.0 ppb (1) N/A 3.0 ppb (3) N/A N/A 27.0 ppb (21) N/A N/A 4.0 μg/m3 (17) 21.0